Alright, let's work through 81685467 times 66769490 step by step
81685467 × 66769490 = 66769490 × (81685467)
+ 66769490 × 7 giving us 467386430
+ 66769490 × 60 that results in 4006169400
+ 66769490 × 400 producing 26707796000
+ 66769490 × 5000 resulting in 333847450000
+ 66769490 × 80000 that equals 5341559200000
+ 66769490 × 600000 producing 40061694000000
+ 66769490 × 1000000 what gives us 66769490000000
+ 66769490 × 80000000 yielding 5341559200000000

= 5454096972001830
