Alright, let's work through 81661532 times 13142311 step by step
81661532 × 13142311 = 13142311 × (81661532)
+ 13142311 × 2 producing 26284622
+ 13142311 × 30 giving us 394269330
+ 13142311 × 500 producing 6571155500
+ 13142311 × 1000 which equals 13142311000
+ 13142311 × 60000 that equals 788538660000
+ 13142311 × 600000 producing 7885386600000
+ 13142311 × 1000000 resulting in 13142311000000
+ 13142311 × 80000000 producing 1051384880000000

= 1073221250280452
