256564365 has 16 divisors (see below), whose sum is σ = 411091200. Its totient is φ = 136638272.

The previous prime is 256564351. The next prime is 256564367. The reversal of 256564365 is 563465652.

It is a cyclic number.

It is not a de Polignac number, because 256564365 - 2¹⁰ = 256563341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256564367) 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, 1110 + ... + 22679.

It is an arithmetic number, because the mean of its divisors is an integer number (25693200).

Almost surely, 2^256564365 is an apocalyptic number.

It is an amenable number.

256564365 is a deficient number, since it is larger than the sum of its proper divisors (154526835).

256564365 is a wasteful number, since it uses less digits than its factorization.

256564365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24516.

The product of its digits is 648000, while the sum is 42.

The square root of 256564365 is about 16017.6266968612. The cubic root of 256564365 is about 635.4266791554.

The spelling of 256564365 in words is "two hundred fifty-six million, five hundred sixty-four thousand, three hundred sixty-five".