Go to google calculator and then put 170! and you will get 7.257416e^(306). then put 171! and you will get infinity. As a astrophysicist I do issues with this :D
I am not an astrophysicist, but I suggest that you, as an astrophysicist, use a mathematics engine that is a bit more robust. Might I suggest Wolfram Alpha:
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[ 5.4 ms ] story [ 16.4 ms ] threadhttp://www.wolframalpha.com/input/?i=171%21