Alright, let's work through 66966645 times 81888376 step by step
66966645 × 81888376 = 81888376 × (66966645)
+ 81888376 × 5 which equals 409441880
+ 81888376 × 40 producing 3275535040
+ 81888376 × 600 what gives us 49133025600
+ 81888376 × 6000 producing 491330256000
+ 81888376 × 60000 which equals 4913302560000
+ 81888376 × 900000 what gives us 73699538400000
+ 81888376 × 6000000 that results in 491330256000000
+ 81888376 × 60000000 that results in 4913302560000000

= 5483789805218520
