The current difficulty is 672.3 PH. The next difficulty is estimated at 675.0 PH, a change of +0.40%. The difficulty changes globally every time a new block is mined, based on how fast blocks are being found.
Hash Price Report
The last block was at height 64,759. The current block reward is 199,013.0 SCP. Based on this and on the current difficulty, miners are being paid 287.1175 SCP/PH, which corresponds to about 24.81 SCP/day per GH/s.