256796989433 has 2 divisors, whose sum is σ = 256796989434. Its totient is φ = 256796989432.

The previous prime is 256796989363. The next prime is 256796989469. The reversal of 256796989433 is 334989697652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140361123904 + 116435865529 = 374648^2 + 341227^2 .

It is a cyclic number.

It is not a de Polignac number, because 256796989433 - 2²⁴ = 256780212217 is a prime.

It is a super-2 number, since 2×256796989433² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256796989483) 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, 128398494716 + 128398494717.

It is an arithmetic number, because the mean of its divisors is an integer number (128398494717).

Almost surely, 2^256796989433 is an apocalyptic number.

It is an amenable number.

256796989433 is a deficient number, since it is larger than the sum of its proper divisors (1).

256796989433 is an equidigital number, since it uses as much as digits as its factorization.

256796989433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529079040, while the sum is 71.

The spelling of 256796989433 in words is "two hundred fifty-six billion, seven hundred ninety-six million, nine hundred eighty-nine thousand, four hundred thirty-three".