Alright, let's work through 80840740 times 82138122 step by step
80840740 × 82138122 = 82138122 × (80840740)
+ 82138122 × 0 resulting in 0
+ 82138122 × 40 that is equal 3285524880
+ 82138122 × 700 that equals 57496685400
+ 82138122 × 0000 that is equal 0
+ 82138122 × 40000 which equals 3285524880000
+ 82138122 × 800000 yielding 65710497600000
+ 82138122 × 0000000 that is equal 0
+ 82138122 × 80000000 giving us 6571049760000000

= 6640106564690280
