The Powerball lottery jackpot — the biggest of the year — is swelling after nobody won in Monday night's drawing.

The jackpot is now $643 million, with the next drawing set for Wednesday night. Although no one took home the full prize, two Powerball players won $1 million each, according to Powerball.

A single Powerball ticket costs $2. The rules of the game are as follows: Players choose five numbers from 1 to 69, and one number between 1 and 26, to be their "Powerball." To win the jackpot a player must match all six numbers on their ticket to the drawn six-number combination.

The odds of winning the top prize are 1 in 292 million, according to Powerball. But these chances don't stop Americans from spending roughly $103 billion on lottery tickets annually, according to data from Motl

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