One of the largest is called Graham's Number, which has so many digits that it can only be expressed as "powers of powers of powers".
The last ten digits of Graham's number are ...2464195387. But the observable universe is too small to contain a written representation of the whole number, even if the digits were of subatomic size. It is many orders of magnitude greater than the number of elementary particles in the known universe.
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A number is never relatively prime.Relatively prime refers to a pair of numbers.
It can be. 16 is relatively prime with 25.
13 and 4 are relatively prime.
13 and 24 are relatively prime.
A number cannot be relatively prime number by itself. It can only be relatively prime in the context of (relativeto) another number. That requires the two numbers not to have any prime factors in common.