Anyway, for those who want to calculate properly, the real chances to win are 1:32468436 if the order doesn't matter, and 1:23377273920 if the order matters and the maximum elligible number is 56.
I don't know mathematical terms in English, so I can't explain the following formula:
Oh, didn't know about the powerball, the estimate with powerball is a tad different in formula, real chances are: 1:194810616