No problem, we've got 19840357 and 78807374 to multiply
19840357 × 78807374 = 78807374 × (19840357)
+ 78807374 × 7 yielding 551651618
+ 78807374 × 50 yielding 3940368700
+ 78807374 × 300 what gives us 23642212200
+ 78807374 × 0000 giving us 0
+ 78807374 × 40000 producing 3152294960000
+ 78807374 × 800000 that results in 63045899200000
+ 78807374 × 9000000 which equals 709266366000000
+ 78807374 × 10000000 yielding 788073740000000

= 1563566434392518
