Alright, let's work through 79815820 times 66826784 step by step
79815820 × 66826784 = 66826784 × (79815820)
+ 66826784 × 0 what gives us 0
+ 66826784 × 20 that results in 1336535680
+ 66826784 × 800 resulting in 53461427200
+ 66826784 × 5000 what gives us 334133920000
+ 66826784 × 10000 yielding 668267840000
+ 66826784 × 800000 resulting in 53461427200000
+ 66826784 × 9000000 what gives us 601441056000000
+ 66826784 × 70000000 that results in 4677874880000000

= 5333834562922880
