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The only common factor is one.
11 and 19 are prime numbers so only common factor is 1.
That depends what numbers. If you mean ALL even and odd numbers, the only common factor or divisor is 1.
There is no such thing as the common factor of a single number. Only two or more numbers can have a common factor. This is like asking what is common between me and myself. Everything. But you could ask what is common between you and your sister.
The ONLY common factor of 25 & 27 is... 1