Alright, let's work through 81876404 times 53371611 step by step
81876404 × 53371611 = 53371611 × (81876404)
+ 53371611 × 4 what gives us 213486444
+ 53371611 × 00 that equals 0
+ 53371611 × 400 that results in 21348644400
+ 53371611 × 6000 resulting in 320229666000
+ 53371611 × 70000 what gives us 3736012770000
+ 53371611 × 800000 what gives us 42697288800000
+ 53371611 × 1000000 that results in 53371611000000
+ 53371611 × 80000000 that equals 4269728880000000

= 4369875584366844
