256165 has 16 divisors (see below), whose sum is σ = 379008. Its totient is φ = 161856.

The previous prime is 256163. The next prime is 256169. The reversal of 256165 is 561652.

It is a cyclic number.

It is not a de Polignac number, because 256165 - 2¹ = 256163 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174 + ... + 736.

It is an arithmetic number, because the mean of its divisors is an integer number (23688).

2²⁵⁶¹⁶⁵ is an apocalyptic number.

It is an amenable number.

256165 is a deficient number, since it is larger than the sum of its proper divisors (122843).

256165 is a wasteful number, since it uses less digits than its factorization.

256165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588.

The product of its digits is 1800, while the sum is 25.

The square root of 256165 is about 506.1274543038. The cubic root of 256165 is about 63.5096808767.

The spelling of 256165 in words is "two hundred fifty-six thousand, one hundred sixty-five".