It's currently around 3 trillion, but there will be a massive burn that will cut it to 3 bn apparently.

Here - this article explains it neatly: http://altcoin-guide.com/the-little-coin-that-could-paccoin/

Personally, I still have no idea what the use of this coin is supposed to be or what the new dev team are planning for it, but I'm pretty happy to see my little $40 investment now worth around $180 after just a couple weeks.