If that's how many number combinations there are,yes.However,you can't be sure how many others will win a particular drawing.So for a $292 million dollar prize you could spend $292 million (or twice that for Power Ball) and wind up winning $100 million.
I don’t know what the upper limit would be but it would be physically impossible to purchase that many tickets by an individual within the time gap between draws. Even with a vast array of allies it would be extremely difficult.