256507172607467 has 2 divisors, whose sum is σ = 256507172607468. Its totient is φ = 256507172607466.

The previous prime is 256507172607449. The next prime is 256507172607541. The reversal of 256507172607467 is 764706271705652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256507172607467 - 2⁸ = 256507172607211 is a prime.

It is not a weakly prime, because it can be changed into another prime (256507172607437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128253586303733 + 128253586303734.

It is an arithmetic number, because the mean of its divisors is an integer number (128253586303734).

Almost surely, 2^{256507172607467} is an apocalyptic number.

256507172607467 is a deficient number, since it is larger than the sum of its proper divisors (1).

256507172607467 is an equidigital number, since it uses as much as digits as its factorization.

256507172607467 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207446400, while the sum is 65.

The spelling of 256507172607467 in words is "two hundred fifty-six trillion, five hundred seven billion, one hundred seventy-two million, six hundred seven thousand, four hundred sixty-seven".