256825567 has 4 divisors (see below), whose sum is σ = 267991920. Its totient is φ = 245659216.

The previous prime is 256825529. The next prime is 256825649. The reversal of 256825567 is 765528652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256825567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256825367) 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 3 ways as a sum of consecutive naturals, for example, 5583142 + ... + 5583187.

It is an arithmetic number, because the mean of its divisors is an integer number (66997980).

Almost surely, 2^256825567 is an apocalyptic number.

256825567 is a deficient number, since it is larger than the sum of its proper divisors (11166353).

256825567 is a wasteful number, since it uses less digits than its factorization.

256825567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11166352.

The product of its digits is 1008000, while the sum is 46.

The square root of 256825567 is about 16025.7782026334. The cubic root of 256825567 is about 635.6422435504.

The spelling of 256825567 in words is "two hundred fifty-six million, eight hundred twenty-five thousand, five hundred sixty-seven".