Euler's Totient Function (Phi φ(n)) Calculator

Calculate Euler totient φ(n) counting integers up to n that are relatively prime to n.

How It Works & Processing Standards

Enter values above to calculate results automatically. Check each input field for guidance and units.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 100,000 characters

Euler's Totient Function (Phi φ(n)) Calculator is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Euler's Totient Function (Phi φ(n)) Calculator

  1. 1
    Enter Integer (n)Type positive integer n.
  2. 2
    Compute φ(n)Evaluate n × Π(1 - 1/p) over prime factors.
  3. 3
    View Totient ValueInspect calculated φ(n).

Common Use Cases

  • Computing RSA key generator totient modulus φ(n) = (p-1)(q-1)
  • Applying Euler's Theorem in modular arithmetic proofs
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