The Powerball jackpot reached an estimated $1 billion ($497.3 million cash) for the next drawing on Halloween.According to lottery officials, this is the second time in Powerball history that the advertised jackpot has reached $1 billion.If a player wins Monday's jackpot, it will be the second largest jackpot in Powerball history.The jackpot rolled after no one matched all six numbers drawn Saturday night - which were 19, 31, 40, 46, 57 and Powerball 23.Six tickets, however, won a $1 million prize after matching all five white balls drawn."