Alright, let's work through 81356726 times 77175973 step by step
81356726 × 77175973 = 77175973 × (81356726)
+ 77175973 × 6 which equals 463055838
+ 77175973 × 20 which equals 1543519460
+ 77175973 × 700 that equals 54023181100
+ 77175973 × 6000 which equals 463055838000
+ 77175973 × 50000 that is equal 3858798650000
+ 77175973 × 300000 that equals 23152791900000
+ 77175973 × 1000000 producing 77175973000000
+ 77175973 × 80000000 which equals 6174077840000000

= 6278784489144398
