Alright, let's work through 808677 times 80193521 step by step
808677 × 80193521 = 80193521 × (808677)
+ 80193521 × 7 producing 561354647
+ 80193521 × 70 which equals 5613546470
+ 80193521 × 600 which equals 48116112600
+ 80193521 × 8000 that results in 641548168000
+ 80193521 × 00000 resulting in 0
+ 80193521 × 800000 that is equal 64154816800000

= 64850655981717
