Alright, let's work through 66417515 times 42534861 step by step
66417515 × 42534861 = 42534861 × (66417515)
+ 42534861 × 5 what gives us 212674305
+ 42534861 × 10 that results in 425348610
+ 42534861 × 500 yielding 21267430500
+ 42534861 × 7000 that results in 297744027000
+ 42534861 × 10000 resulting in 425348610000
+ 42534861 × 400000 that is equal 17013944400000
+ 42534861 × 6000000 that results in 255209166000000
+ 42534861 × 60000000 what gives us 2552091660000000

= 2825059768490415
