Alright, let's work through 66509071 times 65306556 step by step
66509071 × 65306556 = 65306556 × (66509071)
+ 65306556 × 1 giving us 65306556
+ 65306556 × 70 giving us 4571458920
+ 65306556 × 000 what gives us 0
+ 65306556 × 9000 which equals 587759004000
+ 65306556 × 00000 what gives us 0
+ 65306556 × 500000 giving us 32653278000000
+ 65306556 × 6000000 that results in 391839336000000
+ 65306556 × 60000000 yielding 3918393360000000

= 4343478369769476
