Alright, let's work through 81638913 times 24430242 step by step
81638913 × 24430242 = 24430242 × (81638913)
+ 24430242 × 3 resulting in 73290726
+ 24430242 × 10 giving us 244302420
+ 24430242 × 900 that equals 21987217800
+ 24430242 × 8000 that equals 195441936000
+ 24430242 × 30000 that results in 732907260000
+ 24430242 × 600000 which equals 14658145200000
+ 24430242 × 1000000 yielding 24430242000000
+ 24430242 × 80000000 yielding 1954419360000000

= 1994458401206946
