Alright, let's work through 51564928 times 78665196 step by step
51564928 × 78665196 = 78665196 × (51564928)
+ 78665196 × 8 what gives us 629321568
+ 78665196 × 20 giving us 1573303920
+ 78665196 × 900 resulting in 70798676400
+ 78665196 × 4000 what gives us 314660784000
+ 78665196 × 60000 what gives us 4719911760000
+ 78665196 × 500000 yielding 39332598000000
+ 78665196 × 1000000 giving us 78665196000000
+ 78665196 × 50000000 giving us 3933259800000000

= 4056365167845888
