Why Use Totient Function?

Leonhard Euler's totient function, ϕ(n), is an important object in number theory, counting the number of positive integers less than or equal to n which are relatively prime to n.

What does the Totient function do?

Euler's totient function (also called the Phi function) counts the number of positive integers less than n that are coprime to n.

What is Euler's Totient function Why is it important?

Euler's Totient function is the mathematical multiplicative functions which count the positive integers up to the given integer generally called as 'n' that are a prime number to 'n' and the function is used to know the number of prime numbers that exist up to the given integer 'n'.