Alright, let's work through 6405780 times 50066941 step by step
6405780 × 50066941 = 50066941 × (6405780)
+ 50066941 × 0 resulting in 0
+ 50066941 × 80 what gives us 4005355280
+ 50066941 × 700 giving us 35046858700
+ 50066941 × 5000 yielding 250334705000
+ 50066941 × 00000 that results in 0
+ 50066941 × 400000 producing 20026776400000
+ 50066941 × 6000000 what gives us 300401646000000

= 320717809318980
