On Friday, December 31, the Mega Millions lottery will hold its final drawing of the year, with the prize now standing at $640 million.

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 Tuesday was the 30th day without a grand prize winner.

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Driving the news: The jackpot is still anticipated if Friday's drawing yields one or more winning tickets.

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according to Mega Millions, to rank as the sixth-largest in the lottery's 20-year history.

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The cash alternative for December. As of right now, drawing 30 is valued roughly $328.3 million in cash, according to the lottery website.

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The amount falls just short of the 2013 winner of the fifth-largest prize, which was $648 million.

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Rewind: Since the Oct. 18 Mega Millions drawing, which began with a $20 million grand prize, the jackpot has been growing.

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A ticket purchased in Illinois was the sole winner of the $1.34 billion Mega Millions jackpot, which was announced in late July.

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In November, a single ticket that purchased the $2.04 billion Powerball jackpot became the winner of the highest lottery prize in history.

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