(Springfield, IL) — Don’t be surprised by long lines at the gas station. Illinois Lottery officials Monday said the Mega Millions jackpot topped 500 million dollars. In fact, the jackpot may grow before tonight’s drawing, depending on how many people buy tickets today. The largest ever Mega Millions jackpot was 656 million-dollars back in 2012. Your odds of winning this jackpot are about 300 million-to-one.