256659 has 8 divisors (see below), whose sum is σ = 368592. Its totient is φ = 157920.

The previous prime is 256651. The next prime is 256661. The reversal of 256659 is 956652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256659 - 2³ = 256651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3252 + ... + 3329.

It is an arithmetic number, because the mean of its divisors is an integer number (46074).

2²⁵⁶⁶⁵⁹ is an apocalyptic number.

256659 is a deficient number, since it is larger than the sum of its proper divisors (111933).

256659 is a wasteful number, since it uses less digits than its factorization.

256659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6597.

The product of its digits is 16200, while the sum is 33.

The square root of 256659 is about 506.6152386180. The cubic root of 256659 is about 63.5504796281.

The spelling of 256659 in words is "two hundred fifty-six thousand, six hundred fifty-nine".