Alright, let's work through 81840774 times 51488677 step by step
81840774 × 51488677 = 51488677 × (81840774)
+ 51488677 × 4 resulting in 205954708
+ 51488677 × 70 that equals 3604207390
+ 51488677 × 700 that equals 36042073900
+ 51488677 × 0000 producing 0
+ 51488677 × 40000 which equals 2059547080000
+ 51488677 × 800000 that is equal 41190941600000
+ 51488677 × 1000000 what gives us 51488677000000
+ 51488677 × 80000000 which equals 4119094160000000

= 4213873177915998
