It is not possible to give a sensible answer to this question. The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
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3 is the greatest common factor of 69 and 99.
The GCF of 75 and 99 is 3.
3 is the greatest common factor of 42 and 99.
The GCF is 3.
The GCF is 3.