No problem, we've got 81008802 and 80159817 to multiply
81008802 × 80159817 = 80159817 × (81008802)
+ 80159817 × 2 giving us 160319634
+ 80159817 × 00 what gives us 0
+ 80159817 × 800 what gives us 64127853600
+ 80159817 × 8000 yielding 641278536000
+ 80159817 × 00000 what gives us 0
+ 80159817 × 000000 yielding 0
+ 80159817 × 1000000 that equals 80159817000000
+ 80159817 × 80000000 yielding 6412785360000000

= 6493650743709234
