256371567 has 8 divisors (see below), whose sum is σ = 341931696. Its totient is φ = 170862912.

The previous prime is 256371559. The next prime is 256371569. The reversal of 256371567 is 765173652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256371567 - 2³ = 256371559 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256371569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843 + ... + 22659.

It is an arithmetic number, because the mean of its divisors is an integer number (42741462).

Almost surely, 2^256371567 is an apocalyptic number.

256371567 is a deficient number, since it is larger than the sum of its proper divisors (85560129).

256371567 is a wasteful number, since it uses less digits than its factorization.

256371567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25737.

The product of its digits is 264600, while the sum is 42.

The square root of 256371567 is about 16011.6072584860. The cubic root of 256371567 is about 635.2674732416.

The spelling of 256371567 in words is "two hundred fifty-six million, three hundred seventy-one thousand, five hundred sixty-seven".