Alright, let's work through 81668122 times 77085126 step by step
81668122 × 77085126 = 77085126 × (81668122)
+ 77085126 × 2 giving us 154170252
+ 77085126 × 20 what gives us 1541702520
+ 77085126 × 100 producing 7708512600
+ 77085126 × 8000 which equals 616681008000
+ 77085126 × 60000 that is equal 4625107560000
+ 77085126 × 600000 giving us 46251075600000
+ 77085126 × 1000000 what gives us 77085126000000
+ 77085126 × 80000000 resulting in 6166810080000000

= 6295397474553372
