Let's divide 66864566 by 406
The aim is to understand the frequency of 406 in 66864566.

Advancing to step 1:
When dividing 6 by 406, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 406

Going ahead to step 2:
The number 406 fits into 66 0 times, leaving a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Take the next digit (8) from the dividend and append it to 66, then repeat: 668 / 406

Step 3:
668 divided by 406 is 1 with a remainder of 262.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 406 from 668, we get 262.
Include the next digit (6) from the dividend after 262, then repeat: 2626 / 406

Let's proceed to step 4:
The number 406 fits into 2626 6 times, leaving a remainder of 190.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
The remainder is 190 after subtracting 2436 from 2626.
Include the next digit (4) from the dividend after 190, then repeat: 1904 / 406

Advancing to step 5:
406 goes into 1904 4 times with a remainder of 280.
The number 4 becomes the next digit in our result. 
Result so far: 164.0
Deduct 1624 from 1904 and we're left with 280.
Grab the next digit (5) from the dividend, add it to 280, then carry on: 2805 / 406

On to step 6:
2805 divided by 406 is 6 with a remainder of 369.
Put 6 as the next digit of the answer. 
Result so far: 1646.0
If we take 2436 away from 2805, we end up with 369.
Grab the next digit (6) from the dividend, add it to 369, then carry on: 3696 / 406

Step 7:
The number 406 fits into 3696 9 times, leaving a remainder of 42.
The number 9 becomes the next digit in our result. 
Result so far: 16469.0
The remainder is 42 after subtracting 3654 from 3696.
Include the next digit (6) from the dividend after 42, then repeat: 426 / 406

Moving on to step 8:
When dividing 426 by 406, we get 1 with a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 164691.0
The remainder is 20 after subtracting 406 from 426.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
200 divided by 406 is 0 with a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 164691.0
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 10:
When dividing 2000 by 406, we get 4 with a remainder of 376.
Write down 4 as next digit of the result. 
Result so far: 164691.04
If we subtract 1624 from 2000, we get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Going ahead to step 11:
3760 divided by 406 is 9 with a remainder of 106.
The next digit of our result is 9. 
Result so far: 164691.049
If we take 3654 away from 3760, we end up with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Moving on to step 12:
If we divide 1060 by 406, we get 2 and a remainder of 248.
The number 2 becomes the next digit in our result. 
Result so far: 164691.0492
The remainder is 248 after subtracting 812 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Let's proceed to step 13:
406 can be fit into 2480 6 times, resulting in a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 164691.04926
Subtract 2436 from 2480 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 14:
440 divided by 406 is 1 with a remainder of 34.
Put 1 as the next digit of the answer. 
Result so far: 164691.049261
Subtract 406 from 440 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 15:
The number 406 fits into 340 0 times, leaving a remainder of 340.
The number 0 becomes the next digit in our result. 
Result so far: 164691.049261
The remainder is 340 after subtracting 0 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Moving on to step 16:
When dividing 3400 by 406, we get 8 with a remainder of 152.
Use 8 as the next digit of our solution. 
Result so far: 164691.04926108
Subtracting 3248 from 3400 leaves us with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

The final result is 164691.04926108 with a remainder of 1.52e-07.