The notation "φ(1)" refers to the value of the Euler's totient function, denoted as φ. This function counts the number of positive integers up to a given integer that are relatively prime to it. In the case of φ(1), we are looking at the number 1 itself. Since 1 has no positive integers less than it, the only integer to consider is 1. The only integer that is relatively prime to 1 is itself. Therefore, φ(1) equals 1, indicating that there is one integer (which is 1) that is relatively prime to 1.