The California Lottery said Friday that the winning ticket holder who purchased it at a gift shop in San Jose had not come forward.
The jackpot is now revised up to $648 million. The name of a second winner in Georgia has already been announced.
Lottery spokesman Alex Traverso says the winner has a year to claim the money, so people often first confer with a lawyer and financial adviser to craft a plan for handling newfound wealth.
The jackpot comes to a total of $324 million per winner, or a $173.8 lump sum million before taxes.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.