Alright, let's work through 80646293 times 81264342 step by step
80646293 × 81264342 = 81264342 × (80646293)
+ 81264342 × 3 which equals 243793026
+ 81264342 × 90 resulting in 7313790780
+ 81264342 × 200 which equals 16252868400
+ 81264342 × 6000 which equals 487586052000
+ 81264342 × 40000 giving us 3250573680000
+ 81264342 × 600000 giving us 48758605200000
+ 81264342 × 0000000 that equals 0
+ 81264342 × 80000000 giving us 6501147360000000

= 6553667935384206
