Alright, let's work through 19781385 times 12918008 step by step
19781385 × 12918008 = 12918008 × (19781385)
+ 12918008 × 5 what gives us 64590040
+ 12918008 × 80 that equals 1033440640
+ 12918008 × 300 which equals 3875402400
+ 12918008 × 1000 that equals 12918008000
+ 12918008 × 80000 resulting in 1033440640000
+ 12918008 × 700000 giving us 9042605600000
+ 12918008 × 9000000 that equals 116262072000000
+ 12918008 × 10000000 which equals 129180080000000

= 255536089681080
