Alright, let's work through 18999869 times 87455767 step by step
18999869 × 87455767 = 87455767 × (18999869)
+ 87455767 × 9 giving us 787101903
+ 87455767 × 60 what gives us 5247346020
+ 87455767 × 800 what gives us 69964613600
+ 87455767 × 9000 producing 787101903000
+ 87455767 × 90000 giving us 7871019030000
+ 87455767 × 900000 that equals 78710190300000
+ 87455767 × 8000000 that results in 699646136000000
+ 87455767 × 10000000 that equals 874557670000000

= 1661648116294523
