No problem, we've got 80911889 and 78906555 to multiply
80911889 × 78906555 = 78906555 × (80911889)
+ 78906555 × 9 producing 710158995
+ 78906555 × 80 producing 6312524400
+ 78906555 × 800 giving us 63125244000
+ 78906555 × 1000 what gives us 78906555000
+ 78906555 × 10000 producing 789065550000
+ 78906555 × 900000 producing 71015899500000
+ 78906555 × 0000000 that equals 0
+ 78906555 × 80000000 what gives us 6312524400000000

= 6384478419532395
