Alright, let's work through 15849782 times 45047721 step by step
15849782 × 45047721 = 45047721 × (15849782)
+ 45047721 × 2 that equals 90095442
+ 45047721 × 80 that equals 3603817680
+ 45047721 × 700 which equals 31533404700
+ 45047721 × 9000 yielding 405429489000
+ 45047721 × 40000 that equals 1801908840000
+ 45047721 × 800000 giving us 36038176800000
+ 45047721 × 5000000 that results in 225238605000000
+ 45047721 × 10000000 which equals 450477210000000

= 713996557446822
