Alright, let's work through 64825119 times 78825819 step by step
64825119 × 78825819 = 78825819 × (64825119)
+ 78825819 × 9 what gives us 709432371
+ 78825819 × 10 resulting in 788258190
+ 78825819 × 100 that equals 7882581900
+ 78825819 × 5000 that results in 394129095000
+ 78825819 × 20000 resulting in 1576516380000
+ 78825819 × 800000 producing 63060655200000
+ 78825819 × 4000000 that equals 315303276000000
+ 78825819 × 60000000 which equals 4729549140000000

= 5109893096947461
