Alright, let's work through 80420064 times 51143131 step by step
80420064 × 51143131 = 51143131 × (80420064)
+ 51143131 × 4 which equals 204572524
+ 51143131 × 60 producing 3068587860
+ 51143131 × 000 which equals 0
+ 51143131 × 0000 that equals 0
+ 51143131 × 20000 that equals 1022862620000
+ 51143131 × 400000 what gives us 20457252400000
+ 51143131 × 0000000 giving us 0
+ 51143131 × 80000000 producing 4091450480000000

= 4112933868180384
