256556167 has 4 divisors (see below), whose sum is σ = 293207056. Its totient is φ = 219905280.

The previous prime is 256556159. The next prime is 256556203. The reversal of 256556167 is 761655652.

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

It is not a de Polignac number, because 256556167 - 2³ = 256556159 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 (256556567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18325434 + ... + 18325447.

It is an arithmetic number, because the mean of its divisors is an integer number (73301764).

Almost surely, 2^256556167 is an apocalyptic number.

256556167 is a deficient number, since it is larger than the sum of its proper divisors (36650889).

256556167 is an equidigital number, since it uses as much as digits as its factorization.

256556167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36650888.

The product of its digits is 378000, while the sum is 43.

The square root of 256556167 is about 16017.3707892400. The cubic root of 256556167 is about 635.4199111547.

The spelling of 256556167 in words is "two hundred fifty-six million, five hundred fifty-six thousand, one hundred sixty-seven".