You need at least two numbers to find a GCF.
The greatest common factor of 65 , 13 = 13
13 is a prime number & 27 = 3*3*3*1, so the greatest common factor of 13 and 27 would be 1, which is the only common factor.
The GCF is 13.The Greatest Common Factor (GCF) is: 13
The Greatest Common Factor of 13 & 4 is 1 (the only common factor).
The GCF (Greatest Common Factor) of 13 and 26 is: 13
The greatest common factor of 13 and 42 is 1.
The greatest common factor of 13 , 96 = 1
The factors of 13 are 1 and 13. The factors of 16 are 1, 2, 4, 8, and 16. The only common factor is 1. Therefore, 1 is the greatest common factor. This means 13 and 16 are relatively prime. 1, in whole numbers.
The Greatest Common Factor of 143, 65, 91: 13
The Greatest Common Factor of 13, 16: 1
Short answer: There are none. There is neither a greatest common factor nor common factors of a single number, such as 13, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor. The factors of 13 are 1 and 13. Examples: The common factors of 13 and 25 are only 1; the greatest common factor is 1. The common factors of 13 and 52 are 1 and 13; the greatest common factor is 13.
13 is the greatest common factor of 208 and 637. Factor each number: 208 = 2 x 2 x 2 x 2 x 13 637 = 7 x 7 x 13 The only common factor (and thus, the greatest common factor) is 13.