Alright, let's work through 81378539 times 22393745 step by step
81378539 × 22393745 = 22393745 × (81378539)
+ 22393745 × 9 giving us 201543705
+ 22393745 × 30 what gives us 671812350
+ 22393745 × 500 producing 11196872500
+ 22393745 × 8000 giving us 179149960000
+ 22393745 × 70000 that equals 1567562150000
+ 22393745 × 300000 yielding 6718123500000
+ 22393745 × 1000000 producing 22393745000000
+ 22393745 × 80000000 that equals 1791499600000000

= 1822370250838555
