Alright, let's work through 81878189 times 69694686 step by step
81878189 × 69694686 = 69694686 × (81878189)
+ 69694686 × 9 giving us 627252174
+ 69694686 × 80 yielding 5575574880
+ 69694686 × 100 that equals 6969468600
+ 69694686 × 8000 that equals 557557488000
+ 69694686 × 70000 giving us 4878628020000
+ 69694686 × 800000 that equals 55755748800000
+ 69694686 × 1000000 that equals 69694686000000
+ 69694686 × 80000000 yielding 5575574880000000

= 5706474672603654
