Alright, let's work through 81507495 times 2105654 step by step
81507495 × 2105654 = 2105654 × (81507495)
+ 2105654 × 5 what gives us 10528270
+ 2105654 × 90 that equals 189508860
+ 2105654 × 400 which equals 842261600
+ 2105654 × 7000 that is equal 14739578000
+ 2105654 × 00000 yielding 0
+ 2105654 × 500000 producing 1052827000000
+ 2105654 × 1000000 yielding 2105654000000
+ 2105654 × 80000000 that equals 168452320000000

= 171626582876730
