Alright, let's work through 81571508 times 79875526 step by step
81571508 × 79875526 = 79875526 × (81571508)
+ 79875526 × 8 resulting in 639004208
+ 79875526 × 00 yielding 0
+ 79875526 × 500 that results in 39937763000
+ 79875526 × 1000 giving us 79875526000
+ 79875526 × 70000 resulting in 5591286820000
+ 79875526 × 500000 yielding 39937763000000
+ 79875526 × 1000000 what gives us 79875526000000
+ 79875526 × 80000000 giving us 6390042080000000

= 6515567108113208
