256661033 has 16 divisors (see below), whose sum is σ = 267883200. Its totient is φ = 245743680.

The previous prime is 256661029. The next prime is 256661047. The reversal of 256661033 is 330166652.

256661033 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 256661033 - 2² = 256661029 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256661833) 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, 659603 + ... + 659991.

It is an arithmetic number, because the mean of its divisors is an integer number (16742700).

Almost surely, 2^256661033 is an apocalyptic number.

It is an amenable number.

256661033 is a deficient number, since it is larger than the sum of its proper divisors (11222167).

256661033 is a wasteful number, since it uses less digits than its factorization.

256661033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 256661033 is about 16020.6439633368. The cubic root of 256661033 is about 635.5064742239.

The spelling of 256661033 in words is "two hundred fifty-six million, six hundred sixty-one thousand, thirty-three".