Some lotteries sell Powerball® tickets over the Internet, but the service is only available to residents of that jurisdiction. The sale of Powerball tickets over the Internet or by mail across jurisdictional borders is restricted. Lotteries may refuse to pay out prize money on Powerball tickets purchased on any website other than their own. Please contact your lottery with any further questions.
Never choose all odd or all even numbers. Such combinations (either all ‘odd’ numbers, or all ‘even’ numbers) make up only 3% of prizes won. Most winning Mega Millions tickets are notable for having three ‘odd’ and two ‘even’ numbers. Alternatively, you could choose three ‘even’ numbers and two ‘odd’ numbers, although your chances to win won’t be quite as good. The mega-ball number can be either an ‘even’ or an ‘odd’ number, and is not related in any way to your main (white) ball choices.

Reflecting common practice among American lotteries, the jackpot is advertised as a nominal value of annual installments. A cash value option (the usual choice), when chosen by a jackpot winner, pays the approximate present value of the installments. Mega Millions' previous format began on October 19, 2013; its first drawing was three days later. The current version of Mega Millions uses a 5/70 (for the white balls) plus 1/25 (for the "Mega Ball") double matrix to select its winning numbers.
The winner, who has not yet claimed the prize, has 365 days from the draw date to turn in the ticket at one of nine California Lottery District Office locations. The lucky person has two options for payment: A payment plan for about $543 million (before federal taxes) paid out over 29 years or a lump cash sum of $320.5 million (before federal taxes). 
On January 13th, 2016 the American multi-state lottery Powerball set the world-record for the biggest jackpot of all time at USD$1.6 billion when it was won by John and Lisa Robinson of Tennessee, Maureen Smith and David Kaltschmidt of Florida and Marvin and Mae Acosta of California. It was the first time in history a prize had topped the billion dollar mark!
If you’re not using an official state lottery website, the retailer may not be licensed and therefore could have no connection to the state lottery programs. Last year, during the record-breaking $1.6 billion Powerball jackpot, Holyfield says Michigan’s lottery office fielded several calls from consumers who purchased tickets online, only to have the vendor shut down without notice.
You do not have to be a U.S. citizen or U.S. resident to play Powerball®. Players from jurisdictions where Powerball tickets are not sold, either in the United States or outside the country, can purchase Powerball tickets from a retailer licensed or authorized by the selling jurisdiction, if they meet the legal age requirement in the jurisdiction of purchase. Federal and jurisdictional income taxes may apply to any claimed prize money.

The odds of winning the Mega Millions jackpot are 1 in 302.6 million, making them the highest odds of any other state or multi-state lottery game ever played in the United States. However, this means the jackpot can grow to surpass the billion-dollar mark with relative ease. The overall odds of winning any prize are 1 in 24, which is slightly better than that of Powerball, which are 1 in 24.87.
*a tip to know whether the website you are looking at actually buys lottery tickets online or follows the insurance model is to check the wording that they use. If you see the words “Play” then you can be confident it is a company that has agents and buys your tickets physically, if you see the words “Bet” you can be sure it is following the insurance model and you are placing a bet on the outcome of a lottery.
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