Alright, let's work through 80639612 times 64989221 step by step
80639612 × 64989221 = 64989221 × (80639612)
+ 64989221 × 2 resulting in 129978442
+ 64989221 × 10 resulting in 649892210
+ 64989221 × 600 that results in 38993532600
+ 64989221 × 9000 that is equal 584902989000
+ 64989221 × 30000 resulting in 1949676630000
+ 64989221 × 600000 that results in 38993532600000
+ 64989221 × 0000000 producing 0
+ 64989221 × 80000000 that results in 5199137680000000

= 5240705565622252
