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Theoretically, the factor of negative infinity could be infinite. For practical purposes, the smallest factor of any positive nonzero whole number is 1.
The LCF of any pair of numbers is always 1, since it is the lowest number that can be a factor and is a trivial factor of all numbers. The least common factor of any set of numbers is 1.
The least common factor of 2, 3, 4, 5, 6, 7, 8, 9, and 10 is 1.The least (or lowest) factor that any of these numbers has is 1.The least (or lowest) number in the list is 2.
The greatest factor of any number is the number itself. The second greatest factor of any even number is half the number. The second greatest factor of any composite number is the number divided by its smallest prime factor. The second greatest factor of any prime number is 1.
The least common factor of any set of numbers is 1.
The LEAST Common FACTOR of any set of numbers is 1. There is the Least Common MULTIPLE which is the smallest number which is a multiple of both. For 26 and 18 the LCM is 234 There is the GREATEST Common Factor which is the greatest number which is a factor of both. FOr 26 and 18 the GCF is 2.