The GCF of 66 and 189 is 3.
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The greatest common factor of 66 , 132 = 66
The greatest common factor of 42 and 66 is 6.6
The greatest common factor of 66 and 153 is 3.
The Greatest Common Factor of 34 and 66 is 2.
The greatest common factor of 70 , 66 = 2