The Highest Common Factor (HCF) of 99 is 99. This is because 99 is a Prime number, meaning it only has two factors: 1 and 99. Since there are no other common factors between 99 and any other number, the HCF remains 99.
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The HCF of 99 is 99. But it's a factor as opposed to a common factor because there's only one number.