256474929322889 has 2 divisors, whose sum is σ = 256474929322890. Its totient is φ = 256474929322888.

The previous prime is 256474929322841. The next prime is 256474929322957. The reversal of 256474929322889 is 988223929474652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232279942377289 + 24194986945600 = 15240733^2 + 4918840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256474929322889 is a prime.

It is not a weakly prime, because it can be changed into another prime (256474929327889) 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, 128237464661444 + 128237464661445.

It is an arithmetic number, because the mean of its divisors is an integer number (128237464661445).

Almost surely, 2^{256474929322889} is an apocalyptic number.

It is an amenable number.

256474929322889 is a deficient number, since it is larger than the sum of its proper divisors (1).

256474929322889 is an equidigital number, since it uses as much as digits as its factorization.

256474929322889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7524679680, while the sum is 80.

The spelling of 256474929322889 in words is "two hundred fifty-six trillion, four hundred seventy-four billion, nine hundred twenty-nine million, three hundred twenty-two thousand, eight hundred eighty-nine".