Alright, let's work through 80139501 times 51992664 step by step
80139501 × 51992664 = 51992664 × (80139501)
+ 51992664 × 1 what gives us 51992664
+ 51992664 × 00 resulting in 0
+ 51992664 × 500 which equals 25996332000
+ 51992664 × 9000 what gives us 467933976000
+ 51992664 × 30000 resulting in 1559779920000
+ 51992664 × 100000 which equals 5199266400000
+ 51992664 × 0000000 giving us 0
+ 51992664 × 80000000 which equals 4159413120000000

= 4166666148620664
