256215167 has 4 divisors (see below), whose sum is σ = 275924040. Its totient is φ = 236506296.

The previous prime is 256215163. The next prime is 256215233. The reversal of 256215167 is 761512652.

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

It is not a de Polignac number, because 256215167 - 2² = 256215163 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 (256215161) 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, 9854417 + ... + 9854442.

It is an arithmetic number, because the mean of its divisors is an integer number (68981010).

Almost surely, 2^256215167 is an apocalyptic number.

256215167 is a deficient number, since it is larger than the sum of its proper divisors (19708873).

256215167 is a wasteful number, since it uses less digits than its factorization.

256215167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19708872.

The product of its digits is 25200, while the sum is 35.

The square root of 256215167 is about 16006.7225564761. The cubic root of 256215167 is about 635.1382648886.

The spelling of 256215167 in words is "two hundred fifty-six million, two hundred fifteen thousand, one hundred sixty-seven".