Alright, let's work through 7806 times 8511 step by step
7806 × 8511 = 8511 × (7806)
+ 8511 × 6 that is equal 51066
+ 8511 × 00 which equals 0
+ 8511 × 800 what gives us 6808800
+ 8511 × 7000 producing 59577000

= 66436866
