No problem, we've got 18993039 and 42253394 to multiply
18993039 × 42253394 = 42253394 × (18993039)
+ 42253394 × 9 what gives us 380280546
+ 42253394 × 30 what gives us 1267601820
+ 42253394 × 000 resulting in 0
+ 42253394 × 3000 which equals 126760182000
+ 42253394 × 90000 resulting in 3802805460000
+ 42253394 × 900000 what gives us 38028054600000
+ 42253394 × 8000000 which equals 338027152000000
+ 42253394 × 10000000 giving us 422533940000000

= 802520360124366
