256665241 has 16 divisors (see below), whose sum is σ = 296068608. Its totient is φ = 217958400.

The previous prime is 256665229. The next prime is 256665271. The reversal of 256665241 is 142566652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256665241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256665241.

It is not an unprimeable number, because it can be changed into a prime (256665271) 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, 595296 + ... + 595726.

It is an arithmetic number, because the mean of its divisors is an integer number (18504288).

Almost surely, 2^256665241 is an apocalyptic number.

It is an amenable number.

256665241 is a deficient number, since it is larger than the sum of its proper divisors (39403367).

256665241 is a wasteful number, since it uses less digits than its factorization.

256665241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its digits is 86400, while the sum is 37.

The square root of 256665241 is about 16020.7752933496. The cubic root of 256665241 is about 635.5099472828.

The spelling of 256665241 in words is "two hundred fifty-six million, six hundred sixty-five thousand, two hundred forty-one".