Eulers’s phi function* of 666 equals 216.

*Euler’s totient function (or Euler’s phi function), denoted as φ(n) or ϕ(n), is an arithmetic function that counts the positive integers less than or equal to n that are relatively prime to n.

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# Euler’s Phi Function

NOTHING IS BIGGER THAN IT LOOKS

Eulers’s phi function* of 666 equals 216.

*Euler’s totient function (or Euler’s phi function), denoted as φ(n) or ϕ(n), is an arithmetic function that counts the positive integers less than or equal to n that are relatively prime to n.