+The totient function, often denoted φ(n), counts the positive integers up to a given integer 'n' that are [relatively prime](/wiki/coprime) to 'n'. This foundational concept in [number theory](/wiki/number_theory) reveals insights into the multiplicative structure of integers.
+## See also
+- [Prime Number](/wiki/prime_number)
+- [Modular Arithmetic](/wiki/modular_arithmetic)
+- [Euler's Theorem](/wiki/euler's_theorem)
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