Alright, let's work through 81075633 times 68420467 step by step
81075633 × 68420467 = 68420467 × (81075633)
+ 68420467 × 3 yielding 205261401
+ 68420467 × 30 resulting in 2052614010
+ 68420467 × 600 resulting in 41052280200
+ 68420467 × 5000 that results in 342102335000
+ 68420467 × 70000 giving us 4789432690000
+ 68420467 × 000000 which equals 0
+ 68420467 × 1000000 what gives us 68420467000000
+ 68420467 × 80000000 producing 5473637360000000

= 5547232672180611
