256332559531 has 2 divisors, whose sum is σ = 256332559532. Its totient is φ = 256332559530.

The previous prime is 256332559529. The next prime is 256332559543. The reversal of 256332559531 is 135955233652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256332559531 - 2¹ = 256332559529 is a prime.

It is a super-2 number, since 2×256332559531² (a number of 24 digits) contains 22 as substring.

Together with 256332559529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (256332559831) 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, 128166279765 + 128166279766.

It is an arithmetic number, because the mean of its divisors is an integer number (128166279766).

Almost surely, 2^256332559531 is an apocalyptic number.

256332559531 is a deficient number, since it is larger than the sum of its proper divisors (1).

256332559531 is an equidigital number, since it uses as much as digits as its factorization.

256332559531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3645000, while the sum is 49.

The spelling of 256332559531 in words is "two hundred fifty-six billion, three hundred thirty-two million, five hundred fifty-nine thousand, five hundred thirty-one".