Alright, let's work through 8686 times 665 step by step
8686 × 665 = 665 × (8686)
+ 665 × 6 that results in 3990
+ 665 × 80 that results in 53200
+ 665 × 600 that is equal 399000
+ 665 × 8000 producing 5320000

= 5776190
