The OP was edited late last year and still says about a 113 BTC Jackpot however today I learned from PrimeDice support that the JackPot promotion has been ENDED! Wow, such a long standing promotion coming to an abrupt end. It had come to be worth millions so I guess the founders decided to invest it somewhere probably rather than keep this money idle just in case someone wins it.

If you go to
this link, the jackpot info module is still visible, it's just a nostalgic relic now though.
That's likely another record by prime dice that will probably remain unmatched for a long time or perhaps even forever in the crypto space.