No problem, we've got 80845915 and 51198763 to multiply
80845915 × 51198763 = 51198763 × (80845915)
+ 51198763 × 5 which equals 255993815
+ 51198763 × 10 that equals 511987630
+ 51198763 × 900 producing 46078886700
+ 51198763 × 5000 which equals 255993815000
+ 51198763 × 40000 resulting in 2047950520000
+ 51198763 × 800000 yielding 40959010400000
+ 51198763 × 0000000 what gives us 0
+ 51198763 × 80000000 producing 4095901040000000

= 4139210841603145
