256371667 has 2 divisors, whose sum is σ = 256371668. Its totient is φ = 256371666.

The previous prime is 256371637. The next prime is 256371671. The reversal of 256371667 is 766173652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256371667 - 2⁷ = 256371539 is a prime.

It is not a weakly prime, because it can be changed into another prime (256371607) 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 as a sum of consecutive naturals, namely, 128185833 + 128185834.

It is an arithmetic number, because the mean of its divisors is an integer number (128185834).

Almost surely, 2^256371667 is an apocalyptic number.

256371667 is a deficient number, since it is larger than the sum of its proper divisors (1).

256371667 is an equidigital number, since it uses as much as digits as its factorization.

256371667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 43.

The square root of 256371667 is about 16011.6103812202. The cubic root of 256371667 is about 635.2675558388.

The spelling of 256371667 in words is "two hundred fifty-six million, three hundred seventy-one thousand, six hundred sixty-seven".