256501667 has 2 divisors, whose sum is σ = 256501668. Its totient is φ = 256501666.

The previous prime is 256501639. The next prime is 256501697. The reversal of 256501667 is 766105652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256501667 - 2⁸ = 256501411 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256501667.

It is not a weakly prime, because it can be changed into another prime (256501697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128250833 + 128250834.

It is an arithmetic number, because the mean of its divisors is an integer number (128250834).

Almost surely, 2^256501667 is an apocalyptic number.

256501667 is a deficient number, since it is larger than the sum of its proper divisors (1).

256501667 is an equidigital number, since it uses as much as digits as its factorization.

256501667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 256501667 is about 16015.6694209140. The cubic root of 256501667 is about 635.3749140715.

The spelling of 256501667 in words is "two hundred fifty-six million, five hundred one thousand, six hundred sixty-seven".