The number one.
The least common factor is: 1
The least common factor is: 1
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of numbers is 1.
The least common factor of any set of numbers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of positive integers is 1.
The factors of 12 are 1, 2, 3, 4, 6, and 12. The factors of 27 are 1, 3, 9, and 27. The common factors of 12 and 27 are 1 and 3. Therefore, the least common factor (the smallest common factor) is 1.
The least common factor of any two or more positive integers is always 1