No problem, we've got 80660693 and 65844891 to multiply
80660693 × 65844891 = 65844891 × (80660693)
+ 65844891 × 3 which equals 197534673
+ 65844891 × 90 which equals 5926040190
+ 65844891 × 600 giving us 39506934600
+ 65844891 × 0000 producing 0
+ 65844891 × 60000 yielding 3950693460000
+ 65844891 × 600000 that results in 39506934600000
+ 65844891 × 0000000 that equals 0
+ 65844891 × 80000000 giving us 5267591280000000

= 5311094538569463
