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The estimated jackpot of at least $640 million is the highest lottery jackpot ever.

According to the California Lottery, the cash payout for a single jackpot winner in Friday night's drawing would be $389.8 million. If a winner chooses the annual payment option, it would be $20.7 million a year for 26 years -- before taxes. The retailer who sells the winning ticket will receive a bonus of $1 million.

A ticket with all six numbers has not been sold since the Jan. 24 drawing, 18 drawings ago.

The previous largest jackpot on record -- $390 million -- was won in the March 6, 2007, Mega Millions drawing.

The Mega Millions game is played in 41 states, the District of Columbia and the U.S. Virgin Islands. The odds of matching all five numbers and the Mega number is 1 in 175,711,536, according to the Mega Millions website. The overall chance of winning a prize is 1 in 40.