256673167 has 2 divisors, whose sum is σ = 256673168. Its totient is φ = 256673166.

The previous prime is 256673143. The next prime is 256673173. The reversal of 256673167 is 761376652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256673167 - 2²⁷ = 122455439 is a prime.

It is a super-2 number, since 2×256673167² = 131762229315619778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256671167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128336583 + 128336584.

It is an arithmetic number, because the mean of its divisors is an integer number (128336584).

Almost surely, 2^256673167 is an apocalyptic number.

256673167 is a deficient number, since it is larger than the sum of its proper divisors (1).

256673167 is an equidigital number, since it uses as much as digits as its factorization.

256673167 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 256673167 is about 16021.0226577457. The cubic root of 256673167 is about 635.5164888776.

The spelling of 256673167 in words is "two hundred fifty-six million, six hundred seventy-three thousand, one hundred sixty-seven".