Because no one matched all six numbers and won the estimated $1.35 billion jackpot, the top prize increased to $1.55 billion for the next drawing Tuesday night.
There now have been 31 straight drawings without a jackpot winner. The last time someone won the Mega Millions jackpot was April 18.
The $1.55 billion prize would be for a sole winner who chooses the annuity option with payment stretched over 30 years. Most winners opt for a lump-sum payment, which would be an estimated $757.2 million on Tuesday.
A big slice of those winnings would go toward federal taxes, while many states also tax lottery payouts.
The jackpot is so hard to win because of the 1 in 302.6 million odds of matching the numbers on five white balls and a separate mega ball. The odds are better to win smaller prizes, which start at $2.
Mega Millions is played in 45 states, Washington, D.C., and the U.S. Virgin Islands.