660523 has 4 divisors (see below), whose sum is σ = 675928. Its totient is φ = 645120.

The previous prime is 660521. The next prime is 660529. The reversal of 660523 is 325066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660523 - 2¹ = 660521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660494 and 660503.

It is not an unprimeable number, because it can be changed into a prime (660521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7638 + ... + 7723.

It is an arithmetic number, because the mean of its divisors is an integer number (168982).

2⁶⁶⁰⁵²³ is an apocalyptic number.

660523 is a deficient number, since it is larger than the sum of its proper divisors (15405).

660523 is a wasteful number, since it uses less digits than its factorization.

660523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15404.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 660523 is about 812.7256609705. The cubic root of 660523 is about 87.0888685436.

Adding to 660523 its reverse (325066), we get a palindrome (985589).

The spelling of 660523 in words is "six hundred sixty thousand, five hundred twenty-three".