Alright, let's work through 3665 times 4512 step by step
3665 × 4512 = 4512 × (3665)
+ 4512 × 5 that results in 22560
+ 4512 × 60 that equals 270720
+ 4512 × 600 what gives us 2707200
+ 4512 × 3000 what gives us 13536000

= 16536480
