The Powerball jackpot — the largest in U.S. lottery history — is up to $700 million.

No tickets sold for Wednesday’s half-billion-dollar jackpot matched all five numbers plus the Powerball so the jackpot initially climbed to $675 million then went up again on Thursday, surpassing the previous all-time prize of $656 million for a 2012 Mega Millions game.

A Powerball spokeswoman said it was “very unlikely” the jackpot would go as high as $1 billion.

DataSearch LI lottery winnersPHOTOSPast lottery winners on Long Island

“Given that we are in uncharted territory, we are keeping an eye on sales . . . and will adjust the jackpot accordingly,” spokeswoman Kelly Cripe said.

Typically, when jackpots are so large, better-than-anticipated ticket sales generate “bumps,” or significant increases in the grand prize.

It happened three times for Wednesday’s Powerball, which initially was announced as a $400 million jackpot after no winning tickets were picked for the Jan. 2 drawing.

advertisement | advertise on newsday

On Tuesday, the jackpot had “bumped” to $450 million; less than 24 hours later it bumped twice more, to $500 million and then to $524 million.

Saturday’s Powerball prize is worth a lump-sum payment of $428.4 million, before taxes and withholding.

Wednesday’s drawing wasn’t a total loss for players. Nationwide, 14 tickets matched the five numbers but missed the Powerball; those tickets are worth $1 million apiece and include one sold in New York, at a food mart in upstate Fredonia.

The game is played in 44 states, Washington, D.C., Puerto Rico and the U.S. Virgin Islands.

Finally, the chances of winning? One in 292,201,338.

@Newsday

With Patricia Kitchen