Alright, let's work through 66687619 times 72435361 step by step
66687619 × 72435361 = 72435361 × (66687619)
+ 72435361 × 9 resulting in 651918249
+ 72435361 × 10 which equals 724353610
+ 72435361 × 600 resulting in 43461216600
+ 72435361 × 7000 yielding 507047527000
+ 72435361 × 80000 resulting in 5794828880000
+ 72435361 × 600000 what gives us 43461216600000
+ 72435361 × 6000000 that results in 434612166000000
+ 72435361 × 60000000 yielding 4346121660000000

= 4830541756495459
