18 is not a Prime number so no number can have 18 as a prime factor.
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Prime numbers are whole numbers evenly divisible only by themselves and 1. By convention, 1 is not considered a prime number. Zero cannot be divided by itself because division by 0 is not allowed so it cannot meet the definition of being prime.
reciprocal
One-half and two.
Additive inverses
No it isn't, it's divisible by 10 and 2 and 5. Also, No 780 is not a prime number. A prime number is defined as a number whos divisbility is 1 and its self.