Alright, let's work through 7805 times 8191 step by step
7805 × 8191 = 8191 × (7805)
+ 8191 × 5 that is equal 40955
+ 8191 × 00 that is equal 0
+ 8191 × 800 that is equal 6552800
+ 8191 × 7000 giving us 57337000

= 63930755
