The current difficulty is 650.9 PH. The next difficulty is estimated at 653.0 PH, a change of +0.33%. 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 46,416. The current block reward is 208,191.6 SCP. Based on this and on the current difficulty, miners are being paid 310.2691 SCP/PH, which corresponds to about 26.81 SCP/day per GH/s.