Alright, let's work through 81351518 times 26677356 step by step
81351518 × 26677356 = 26677356 × (81351518)
+ 26677356 × 8 giving us 213418848
+ 26677356 × 10 resulting in 266773560
+ 26677356 × 500 that equals 13338678000
+ 26677356 × 1000 that equals 26677356000
+ 26677356 × 50000 giving us 1333867800000
+ 26677356 × 300000 what gives us 8003206800000
+ 26677356 × 1000000 giving us 26677356000000
+ 26677356 × 80000000 giving us 2134188480000000

= 2170243406826408
