No problem, we've got 81773664 and 71869613 to multiply
81773664 × 71869613 = 71869613 × (81773664)
+ 71869613 × 4 yielding 287478452
+ 71869613 × 60 yielding 4312176780
+ 71869613 × 600 yielding 43121767800
+ 71869613 × 3000 which equals 215608839000
+ 71869613 × 70000 which equals 5030872910000
+ 71869613 × 700000 that is equal 50308729100000
+ 71869613 × 1000000 that is equal 71869613000000
+ 71869613 × 80000000 that results in 5749569040000000

= 5877041585272032
