No problem, we've got 63845399 and 84869997 to multiply
63845399 × 84869997 = 84869997 × (63845399)
+ 84869997 × 9 resulting in 763829973
+ 84869997 × 90 that results in 7638299730
+ 84869997 × 300 what gives us 25460999100
+ 84869997 × 5000 that results in 424349985000
+ 84869997 × 40000 that results in 3394799880000
+ 84869997 × 800000 which equals 67895997600000
+ 84869997 × 3000000 which equals 254609991000000
+ 84869997 × 60000000 producing 5092199820000000

= 5418558821593803
