Alright, let's work through 80540114 times 66383583 step by step
80540114 × 66383583 = 66383583 × (80540114)
+ 66383583 × 4 that equals 265534332
+ 66383583 × 10 that results in 663835830
+ 66383583 × 100 which equals 6638358300
+ 66383583 × 0000 giving us 0
+ 66383583 × 40000 what gives us 2655343320000
+ 66383583 × 500000 that is equal 33191791500000
+ 66383583 × 0000000 resulting in 0
+ 66383583 × 80000000 that equals 5310686640000000

= 5346541342548462
