660537 has 12 divisors (see below), whose sum is σ = 995904. Its totient is φ = 421080.

The previous prime is 660529. The next prime is 660547. The reversal of 660537 is 735066.

It is not a de Polignac number, because 660537 - 2³ = 660529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660537.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1389 + ... + 1802.

It is an arithmetic number, because the mean of its divisors is an integer number (82992).

2⁶⁶⁰⁵³⁷ is an apocalyptic number.

It is an amenable number.

660537 is a deficient number, since it is larger than the sum of its proper divisors (335367).

660537 is a wasteful number, since it uses less digits than its factorization.

660537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220 (or 3217 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 660537 is about 812.7342739174. The cubic root of 660537 is about 87.0894838316.

Subtracting 660537 from its reverse (735066), we obtain a square (74529 = 273²).

The spelling of 660537 in words is "six hundred sixty thousand, five hundred thirty-seven".