Alright, let's work through 81393418 times 19806074 step by step
81393418 × 19806074 = 19806074 × (81393418)
+ 19806074 × 8 that equals 158448592
+ 19806074 × 10 which equals 198060740
+ 19806074 × 400 that is equal 7922429600
+ 19806074 × 3000 giving us 59418222000
+ 19806074 × 90000 yielding 1782546660000
+ 19806074 × 300000 giving us 5941822200000
+ 19806074 × 1000000 that results in 19806074000000
+ 19806074 × 80000000 yielding 1584485920000000

= 1612084060020932
