66067903 divided by 391 
The aim is to understand the frequency of 391 in 66067903.

Going ahead to step 1:
If we divide 6 by 391, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 391

On to step 2:
391 goes into 66 0 times with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Fetch the next digit (0) from the dividend, attach it to 66 and continue: 660 / 391

Let's proceed to step 3:
391 can be fit into 660 1 times, resulting in a remainder of 269.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 391 from 660 to get 269.
Append the next digit (6) from the dividend to 269 and continue with: 2696 / 391

Advancing to step 4:
391 can be fit into 2696 6 times, resulting in a remainder of 350.
Write down 6 as next digit of the result. 
Result so far: 16.0
If we take 2346 away from 2696, we end up with 350.
Bring next digit (7) of the dividend behind the 350 and repeat the process: 3507 / 391

Advancing to step 5:
The number 391 fits into 3507 8 times, leaving a remainder of 379.
Write down 8 as next digit of the result. 
Result so far: 168.0
If we subtract 3128 from 3507, we get 379.
Grab the next digit (9) from the dividend, add it to 379, then carry on: 3799 / 391

Let's proceed to step 6:
If we divide 3799 by 391, we get 9 and a remainder of 280.
The number 9 becomes the next digit in our result. 
Result so far: 1689.0
If we subtract 3519 from 3799, we get 280.
Include the next digit (0) from the dividend after 280, then repeat: 2800 / 391

Moving on to step 7:
391 can be fit into 2800 7 times, resulting in a remainder of 63.
Write down 7 as next digit of the result. 
Result so far: 16897.0
If we take 2737 away from 2800, we end up with 63.
Include the next digit (3) from the dividend after 63, then repeat: 633 / 391

Let's proceed to step 8:
If we divide 633 by 391, we get 1 and a remainder of 242.
Write down 1 as next digit of the result. 
Result so far: 168971.0
If we take 391 away from 633, we end up with 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Let's proceed to step 9:
391 can be fit into 2420 6 times, resulting in a remainder of 74.
Use 6 as the next digit of our solution. 
Result so far: 168971.6
Subtract 2346 from 2420 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 10:
When dividing 740 by 391, we get 1 with a remainder of 349.
The number 1 becomes the next digit in our result. 
Result so far: 168971.61
If we take 391 away from 740, we end up with 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Step 11:
3490 divided by 391 is 8 with a remainder of 362.
Record the quotient 8 as the next digit in the result. 
Result so far: 168971.618
If we subtract 3128 from 3490, we get 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

On to step 12:
If we divide 3620 by 391, we get 9 and a remainder of 101.
Record the quotient 9 as the next digit in the result. 
Result so far: 168971.6189
Deduct 3519 from 3620 and we're left with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Going ahead to step 13:
391 can be fit into 1010 2 times, resulting in a remainder of 228.
The number 2 becomes the next digit in our result. 
Result so far: 168971.61892
If we subtract 782 from 1010, we get 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Going ahead to step 14:
391 goes into 2280 5 times with a remainder of 325.
The number 5 becomes the next digit in our result. 
Result so far: 168971.618925
Subtracting 1955 from 2280 leaves us with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Let's proceed to step 15:
The number 391 fits into 3250 8 times, leaving a remainder of 122.
The number 8 becomes the next digit in our result. 
Result so far: 168971.6189258
Subtract 3128 from 3250 to get 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Step 16:
The number 391 fits into 1220 3 times, leaving a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 168971.61892583
Subtracting 1173 from 1220 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

The final result is 168971.61892583 with a remainder of 4.7e-08.