660535 has 16 divisors (see below), whose sum is σ = 885600. Its totient is φ = 470016.

The previous prime is 660529. The next prime is 660547. The reversal of 660535 is 535066.

It is not a de Polignac number, because 660535 - 2⁵ = 660503 is a prime.

660535 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1411 + ... + 1819.

It is an arithmetic number, because the mean of its divisors is an integer number (55350).

2⁶⁶⁰⁵³⁵ is an apocalyptic number.

660535 is a deficient number, since it is larger than the sum of its proper divisors (225065).

660535 is a wasteful number, since it uses less digits than its factorization.

660535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 660535 is about 812.7330435020. The cubic root of 660535 is about 87.0893959338.

The spelling of 660535 in words is "six hundred sixty thousand, five hundred thirty-five".