Alright, let's work through 64667920 times 99166814 step by step
64667920 × 99166814 = 99166814 × (64667920)
+ 99166814 × 0 which equals 0
+ 99166814 × 20 that is equal 1983336280
+ 99166814 × 900 yielding 89250132600
+ 99166814 × 7000 yielding 694167698000
+ 99166814 × 60000 which equals 5950008840000
+ 99166814 × 600000 what gives us 59500088400000
+ 99166814 × 4000000 that equals 396667256000000
+ 99166814 × 60000000 that results in 5950008840000000

= 6412911594406880
