A/C Idler (?) pulley resists turning by hand... burning belt.

First off, is this what the pulley above the A/C compressor is called or something else?

I started smelling a burning serpentine belt a couple days ago when it was raining and thought, perhaps the old belt has stretched enough that a little moisture is causing it to slip. So I got a new belt and slapped it on there... seemed to be running right so I called it a day. Well it's definitely still burning, not enough that I can smell it driving, but certainly enough that the smell floats around the car for a minute after I shut it down.

Anyhow, I spun all the pulleys by hand today and they all spin like a top except for this pulley above the A/C, it spins smoothly but takes some effort and won't spin by itself. I am assuming it's supposed to spin freely like the others right? Can I just take this pulley to autozone and match it, or do I need some special part number? And one last question, are the pulley bolts normal threaded or reverse threaded?

TIA