By Scott Malone BOSTON (Reuters) - Change your cell phone number, keep your head down and take at least six months before making any major decisions. That was some of the advice offered by financial advisors who warned that the lucky winners of Wednesday's record-setting $1.5 billion U.S. Powerball lottery jackpot should be ready for unexpected stresses. The prize is large enough that a winner choosing the option of receiving 30 $50 million installments over the next 29 years could easily pay off the $129,579 in debt the average U.S. ...

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