660959 has 6 divisors (see below), whose sum is σ = 715896. Its totient is φ = 609960.

The previous prime is 660949. The next prime is 660973. The reversal of 660959 is 959066.

It is a de Polignac number, because none of the positive numbers 2^k-660959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1787 + ... + 2124.

It is an arithmetic number, because the mean of its divisors is an integer number (119316).

2⁶⁶⁰⁹⁵⁹ is an apocalyptic number.

660959 is a deficient number, since it is larger than the sum of its proper divisors (54937).

660959 is a wasteful number, since it uses less digits than its factorization.

660959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937 (or 3924 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 660959 is about 812.9938499152. The cubic root of 660959 is about 87.1080262894.

The spelling of 660959 in words is "six hundred sixty thousand, nine hundred fifty-nine".