Alright, let's work through 80693454 times 65481519 step by step
80693454 × 65481519 = 65481519 × (80693454)
+ 65481519 × 4 resulting in 261926076
+ 65481519 × 50 that equals 3274075950
+ 65481519 × 400 that equals 26192607600
+ 65481519 × 3000 yielding 196444557000
+ 65481519 × 90000 producing 5893336710000
+ 65481519 × 600000 yielding 39288911400000
+ 65481519 × 0000000 that results in 0
+ 65481519 × 80000000 that results in 5238521520000000

= 5283929941276626
