Between the nation's two largest lotteries, there's nearly $1 billion in jackpot money up for grabs. The odds of hitting all winning numbers in either game? Pretty bad.

For the $654 million Mega Million jackpot — which marks the game's second-largest top prize ever — your chance of winning is 1 in 302.6 million. For Powerball's $345 million top prize, it's 1 in 292 million.

The chance of winning both is at least 1 in 88 quadrillion. That's 88 followed by 15 zeros.