Project euler no. 3

[Someone Something]

Project euler (in case you don't know: projecteuler.net)

I'm trying to do the third one and here's my current code:

  1 def checkPrime (x):
  2     factors=2;
  3     while factors<=x:
  4         if x==factors:
  5             return True;
  6         elif x%factors==0:
  7             return False;
  8         elif x%factors!=0:
  9             factors=factors+1;
 10
 11 factorl=[];
 12 factors=600851475142;
 13
 14 while factors != 1:
 15     if 600851475143%factors==0:
 16         if checkPrime(factors)==True:
 17             print factors;
 18         else:
 19             factors=factors-1;
 20
 21     else:
 22         factors=factors-1;
 23

And it just gets frozen when I run it. I put a

print "Loop completed"

in one of the loops and it showed up just fine. So, there are two
possibilities:
1. Its looping in the trillions and taking a while
2. I have a forever loop somewhere
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