Anything that isn't 1,2,3,6,9 or 18.
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1,2,3,6,9,18
The number 1 is a factor of 18 and 5.
18 is not a prime number so no number can have 18 as a prime factor.
18 is a composite number because it has at least one positive factor other than one or itself.
The LEAST Common FACTOR of any set of numbers is 1. There is the Least Common MULTIPLE which is the smallest number which is a multiple of both. For 26 and 18 the LCM is 234 There is the GREATEST Common Factor which is the greatest number which is a factor of both. FOr 26 and 18 the GCF is 2.