256885567 has 16 divisors (see below), whose sum is σ = 282009600. Its totient is φ = 233059680.

The previous prime is 256885553. The next prime is 256885591. The reversal of 256885567 is 765588652.

It is a cyclic number.

It is not a de Polignac number, because 256885567 - 2¹¹ = 256883519 is a prime.

It is a super-2 number, since 2×256885567² = 131980389065822978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256885547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68142 + ... + 71812.

It is an arithmetic number, because the mean of its divisors is an integer number (17625600).

Almost surely, 2^256885567 is an apocalyptic number.

256885567 is a deficient number, since it is larger than the sum of its proper divisors (25124033).

256885567 is a wasteful number, since it uses less digits than its factorization.

256885567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846.

The product of its digits is 4032000, while the sum is 52.

The square root of 256885567 is about 16027.6500772883. The cubic root of 256885567 is about 635.6917396156.

The spelling of 256885567 in words is "two hundred fifty-six million, eight hundred eighty-five thousand, five hundred sixty-seven".