Alright, let's work through 81800275 times 81822269 step by step
81800275 × 81822269 = 81822269 × (81800275)
+ 81822269 × 5 giving us 409111345
+ 81822269 × 70 what gives us 5727558830
+ 81822269 × 200 giving us 16364453800
+ 81822269 × 0000 that is equal 0
+ 81822269 × 00000 that is equal 0
+ 81822269 × 800000 giving us 65457815200000
+ 81822269 × 1000000 resulting in 81822269000000
+ 81822269 × 80000000 that equals 6545781520000000

= 6693084105323975
