It’s a mega win. One Illinois ticket holder has won a whopping $1.337 billion after all of their numbers matched the latest drawing in the billion-dollar Summer Splendor-Mega Millions jackpot. The $1.337 billion figure is based on a 29-year installment plan. Most people opt for the cash option, which is this case is a staggering $780.5 million. The winning ticket matched the white balls from Friday’s drawing: 13, 36, 45, 57 and 67 as well as the gold Mega Ball 14. The jackpot is the second-largest since the game debuted two decades ago. The largest was a $1.537 billion pot in 2018. That ticket…