There are 6 letter in the word crisis so the answer seems to be 6! (6 factorial), but there are two 'i's and two 's's which are indistinguishable and each of which can be arranged in 2! ways. So:
number_of_ways = 6!/2!2!
= 180 ways.
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There are 1,663,200 ways.
There are 9!/(2!*2!*2!) = 45360 ways.
There are 8!/(2!*2!*2!) = 5040 ways.
In a straight line, 5! = 5*4*3*2*1 = 120 ways.
4: the two m and o can be swapped without affecting the spelling.