Alright, let's work through 81601499 times 77209171 step by step
81601499 × 77209171 = 77209171 × (81601499)
+ 77209171 × 9 that is equal 694882539
+ 77209171 × 90 that results in 6948825390
+ 77209171 × 400 producing 30883668400
+ 77209171 × 1000 resulting in 77209171000
+ 77209171 × 00000 that results in 0
+ 77209171 × 600000 that is equal 46325502600000
+ 77209171 × 1000000 producing 77209171000000
+ 77209171 × 80000000 that is equal 6176733680000000

= 6300384090147329
