9,615,384,615,384 withdrawn. 1,000,000,000,000,000 to withdraw.

The top witness in the steem network has these numbers.

https://steemd.com/@arhag

I see one of the numbers is related to Steem Power. How was that withdrawn and what about the larger number to withdraw? What do these numbers mean exactly?

https://steemit.com/@arhag/transfers