256817225167 has 2 divisors, whose sum is σ = 256817225168. Its totient is φ = 256817225166.

The previous prime is 256817225099. The next prime is 256817225173. The reversal of 256817225167 is 761522718652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256817225167 - 2¹¹ = 256817223119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256817225177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128408612583 + 128408612584.

It is an arithmetic number, because the mean of its divisors is an integer number (128408612584).

Almost surely, 2^256817225167 is an apocalyptic number.

256817225167 is a deficient number, since it is larger than the sum of its proper divisors (1).

256817225167 is an equidigital number, since it uses as much as digits as its factorization.

256817225167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2822400, while the sum is 52.

The spelling of 256817225167 in words is "two hundred fifty-six billion, eight hundred seventeen million, two hundred twenty-five thousand, one hundred sixty-seven".