Alright, let's work through 18075358 times 81390018 step by step
18075358 × 81390018 = 81390018 × (18075358)
+ 81390018 × 8 producing 651120144
+ 81390018 × 50 what gives us 4069500900
+ 81390018 × 300 that results in 24417005400
+ 81390018 × 5000 that results in 406950090000
+ 81390018 × 70000 that results in 5697301260000
+ 81390018 × 000000 that is equal 0
+ 81390018 × 8000000 that equals 651120144000000
+ 81390018 × 10000000 resulting in 813900180000000

= 1471153712976444
