660539 has 12 divisors (see below), whose sum is σ = 746928. Its totient is φ = 583440.

The previous prime is 660529. The next prime is 660547. The reversal of 660539 is 935066.

It is not a de Polignac number, because 660539 - 2¹⁶ = 595003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660509) 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, 6362 + ... + 6464.

It is an arithmetic number, because the mean of its divisors is an integer number (62244).

2⁶⁶⁰⁵³⁹ is an apocalyptic number.

660539 is a deficient number, since it is larger than the sum of its proper divisors (86389).

660539 is a wasteful number, since it uses less digits than its factorization.

660539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 660539 is about 812.7355043309. The cubic root of 660539 is about 87.0895717291.

The spelling of 660539 in words is "six hundred sixty thousand, five hundred thirty-nine".