Alright, let's work through 71712546 times 66154120 step by step
71712546 × 66154120 = 66154120 × (71712546)
+ 66154120 × 6 which equals 396924720
+ 66154120 × 40 yielding 2646164800
+ 66154120 × 500 giving us 33077060000
+ 66154120 × 2000 that equals 132308240000
+ 66154120 × 10000 resulting in 661541200000
+ 66154120 × 700000 which equals 46307884000000
+ 66154120 × 1000000 that is equal 66154120000000
+ 66154120 × 70000000 that equals 4630788400000000

= 4744080373589520
