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(NBC NEWS) - The rush for the numbers is on.

Millions are looking to beat the odds and the deadline before tonight's Powerball drawing.

Lottery officials say a billion tickets or more will be sold before the numbers are pulled tonight.

The winner will receive the biggest money in Powerball history, a jackpot of $500-million that's still growing.

You'll have to beat 175,000,000-to-1 odds.

For comparison, you have a better chance at becoming an astronaut, being elected president, winning an Academy Award or being struck by lightning multiple times.

Ticket sales end at 10 o'clock tonight Eastern time - 8 p.m. Tucson time.

The drawing is at 10:59 p.m. Eastern, or 8:59 p.m. Tucson time.