5 is.
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13 is the greatest prime factor of 52.
Greatest Prime Factor of 70The prime factorization of 70 is 2 X 5 X 7, so the greatest prime factor in the prime factorization of 70 is 7.
It is 1 because 19 is a prime number
The greatest common factor of two or more prime numbers is 1.
If you mean the greatest prime factor of 210 it is 7.