No problem, we've got 80249529 and 81103379 to multiply
80249529 × 81103379 = 81103379 × (80249529)
+ 81103379 × 9 yielding 729930411
+ 81103379 × 20 producing 1622067580
+ 81103379 × 500 producing 40551689500
+ 81103379 × 9000 which equals 729930411000
+ 81103379 × 40000 that results in 3244135160000
+ 81103379 × 200000 giving us 16220675800000
+ 81103379 × 0000000 giving us 0
+ 81103379 × 80000000 that equals 6488270320000000

= 6508507965058491
