No problem, we've got 80669299 and 8002446 to multiply
80669299 × 8002446 = 8002446 × (80669299)
+ 8002446 × 9 which equals 72022014
+ 8002446 × 90 resulting in 720220140
+ 8002446 × 200 that results in 1600489200
+ 8002446 × 9000 yielding 72022014000
+ 8002446 × 60000 producing 480146760000
+ 8002446 × 600000 that is equal 4801467600000
+ 8002446 × 0000000 which equals 0
+ 8002446 × 80000000 yielding 640195680000000

= 645551709105354
