' 1 ' is.
The factors from greatest to least are: 11,11,5,3,3. The smallest prime factor is 3. You can get a quick idea of this by the fact that the digital root (number that goes evenly into the sum off all digits) is 18 which is divisible by 3.
180
The number 1 is a factor of 18 and 5.
The smallest factor of any positive integer 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 highest common factor of 18 and 66 is 6
1 is the only common factor of 18 and 61.
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18, as it goes into 360 twenty times.
18 goes into 36 so18 is GCF
The highest common factor of 21 and 18 is 3