Alright, let's work through 66647181 times 67642759 step by step
66647181 × 67642759 = 67642759 × (66647181)
+ 67642759 × 1 resulting in 67642759
+ 67642759 × 80 producing 5411420720
+ 67642759 × 100 which equals 6764275900
+ 67642759 × 7000 producing 473499313000
+ 67642759 × 40000 resulting in 2705710360000
+ 67642759 × 600000 yielding 40585655400000
+ 67642759 × 6000000 giving us 405856554000000
+ 67642759 × 60000000 what gives us 4058565540000000

= 4508199202412379
