Alright, let's work through 80942013 times 51502409 step by step
80942013 × 51502409 = 51502409 × (80942013)
+ 51502409 × 3 that results in 154507227
+ 51502409 × 10 that equals 515024090
+ 51502409 × 000 giving us 0
+ 51502409 × 2000 that results in 103004818000
+ 51502409 × 40000 which equals 2060096360000
+ 51502409 × 900000 producing 46352168100000
+ 51502409 × 0000000 producing 0
+ 51502409 × 80000000 resulting in 4120192720000000

= 4168708658809317
