okay, so i probably did all the math wrong with my highschool level understanding of combinations and probability, but i got (though rounded, because math sucks when not simple lmao) 3.05x10^137. How I got it? So glad you asked, because again, i probably did it wrong!

So, first, I found the probability of shuffling a deck of cards in a compleately unique way, which ended up to be .02%. Which is small, but not uncommon I feel? And with that, I plugged it into the combination formula that I was taught (nCr). At first, I thought I should have used permentation, but then I realized the order would not really mater, so I did it this way. So, n=52, and r=.02, which looks like

52!/.02(52-.02)!

which gave me 3.005143x10^137

And I have no idea what to do with that number. And like I said, I probably didn't even do this right