Alright, let's work through 18111872 times 72732403 step by step
18111872 × 72732403 = 72732403 × (18111872)
+ 72732403 × 2 what gives us 145464806
+ 72732403 × 70 that equals 5091268210
+ 72732403 × 800 producing 58185922400
+ 72732403 × 1000 that results in 72732403000
+ 72732403 × 10000 yielding 727324030000
+ 72732403 × 100000 giving us 7273240300000
+ 72732403 × 8000000 yielding 581859224000000
+ 72732403 × 10000000 that results in 727324030000000

= 1317319973388416
