Alright, let's work through 80640224 times 80954649 step by step
80640224 × 80954649 = 80954649 × (80640224)
+ 80954649 × 4 that results in 323818596
+ 80954649 × 20 that equals 1619092980
+ 80954649 × 200 that is equal 16190929800
+ 80954649 × 0000 producing 0
+ 80954649 × 40000 giving us 3238185960000
+ 80954649 × 600000 resulting in 48572789400000
+ 80954649 × 0000000 yielding 0
+ 80954649 × 80000000 giving us 6476371920000000

= 6528201029201376
