Alright, let's work through 15159020 times 79997997 step by step
15159020 × 79997997 = 79997997 × (15159020)
+ 79997997 × 0 resulting in 0
+ 79997997 × 20 that results in 1599959940
+ 79997997 × 000 giving us 0
+ 79997997 × 9000 that results in 719981973000
+ 79997997 × 50000 yielding 3999899850000
+ 79997997 × 100000 what gives us 7999799700000
+ 79997997 × 5000000 what gives us 399989985000000
+ 79997997 × 10000000 resulting in 799979970000000

= 1212691236482940
