The difficulty isn't in terms of hashes, its just the difficulty.
The current Bitcoin network at time of this post is an estimated 11 PHash
Exactly. Salty is 100% correct.
Hash rate (approx)= 10,938,061 GH/s = 10,938 TH/s = 10.98 PHash
( = 10,938,061,000 MH/s =10,938,061,000,000 KH/s = 10,938,061,000,000,000 H/s)
Difficulty is not measured in hashes, but just is how difficult it is to find a new block compared to the easiest it could be.
(
https://en.bitcoin.it/wiki/Difficulty)
The higher the hash rate, the higher the difficulty will become in order to keep the block time close to an average of 10 minutes (given the hash rate increases, the average has been well under 10 minutes/block recently which is why we see the large increases in difficulty every 2016 blocks which should be about 2 weeks, but is faster now with the new ASICs being shipped each week).