256754456231213 has 2 divisors, whose sum is σ = 256754456231214. Its totient is φ = 256754456231212.

The previous prime is 256754456231177. The next prime is 256754456231263. The reversal of 256754456231213 is 312132654457652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249784021966249 + 6970434264964 = 15804557^2 + 2640158^2 .

It is a cyclic number.

It is not a de Polignac number, because 256754456231213 - 2⁶ = 256754456231149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256754456231263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128377228115606 + 128377228115607.

It is an arithmetic number, because the mean of its divisors is an integer number (128377228115607).

Almost surely, 2^{256754456231213} is an apocalyptic number.

It is an amenable number.

256754456231213 is a deficient number, since it is larger than the sum of its proper divisors (1).

256754456231213 is an equidigital number, since it uses as much as digits as its factorization.

256754456231213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288000, while the sum is 56.

The spelling of 256754456231213 in words is "two hundred fifty-six trillion, seven hundred fifty-four billion, four hundred fifty-six million, two hundred thirty-one thousand, two hundred thirteen".