Alright, let's work through 80852539 times 51338782 step by step
80852539 × 51338782 = 51338782 × (80852539)
+ 51338782 × 9 giving us 462049038
+ 51338782 × 30 that equals 1540163460
+ 51338782 × 500 what gives us 25669391000
+ 51338782 × 2000 that results in 102677564000
+ 51338782 × 50000 that equals 2566939100000
+ 51338782 × 800000 that results in 41071025600000
+ 51338782 × 0000000 yielding 0
+ 51338782 × 80000000 yielding 4107102560000000

= 4150870873867498
