There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
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55... 5 x 55 = 275
1155 is a composite number because it has factors other than 1 and itself. It is not a prime number.The 16 factors of 1155 are 1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, 385, and 1155.The proper factors of 1155 are 1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, and 385 or,if the definition you are using excludes 1, they are 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, and 385.The prime factors of 1155 are 3, 5, 7, and 11.The 4 distinct prime factors (listing each prime factor only once) of 1155 are 3, 5, 7, and 11.The prime factorization of 1155 is 3 x 5 x 7 x 11.NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.
The factors of 110 are 1, 2, 5, 10, 11, 22, 55, 1101, 2, 5, 10, 11, 22, 55, 110.1, 2, 5, 10, 11, 22, 55, 110.
The common factors are: 1, 23
The common factors are: 1, 2, 4