Alright, let's work through 83776821 times 97543703 step by step
83776821 × 97543703 = 97543703 × (83776821)
+ 97543703 × 1 producing 97543703
+ 97543703 × 20 resulting in 1950874060
+ 97543703 × 800 giving us 78034962400
+ 97543703 × 6000 producing 585262218000
+ 97543703 × 70000 yielding 6828059210000
+ 97543703 × 700000 producing 68280592100000
+ 97543703 × 3000000 producing 292631109000000
+ 97543703 × 80000000 yielding 7803496240000000

= 8171901345908163
