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The greatest factor of any number is the number itself. There is no integer that is the greatest factor of every number. One is a factor of every number. One is the GCF of co-prime numbers.

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9y ago
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12y ago

That's known as the greatest common factor, or GCF.

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13y ago

1. It is the only common factor of two (or more) primes.

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Q: Which number is greatest factor of every number?
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