Alright, let's work through 66770784 times 13480021 step by step
66770784 × 13480021 = 13480021 × (66770784)
+ 13480021 × 4 yielding 53920084
+ 13480021 × 80 what gives us 1078401680
+ 13480021 × 700 which equals 9436014700
+ 13480021 × 0000 which equals 0
+ 13480021 × 70000 that results in 943601470000
+ 13480021 × 700000 that results in 9436014700000
+ 13480021 × 6000000 that equals 80880126000000
+ 13480021 × 60000000 which equals 808801260000000

= 900071570506464
