Alright, let's work through 80412968 times 82638117 step by step
80412968 × 82638117 = 82638117 × (80412968)
+ 82638117 × 8 what gives us 661104936
+ 82638117 × 60 yielding 4958287020
+ 82638117 × 900 giving us 74374305300
+ 82638117 × 2000 which equals 165276234000
+ 82638117 × 10000 producing 826381170000
+ 82638117 × 400000 which equals 33055246800000
+ 82638117 × 0000000 producing 0
+ 82638117 × 80000000 that is equal 6611049360000000

= 6645176257901256
