256523754403 has 4 divisors (see below), whose sum is σ = 293170005040. Its totient is φ = 219877503768.

The previous prime is 256523754379. The next prime is 256523754413. The reversal of 256523754403 is 304457325652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256523754403 - 2³⁷ = 119084800931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256523754413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18323125308 + ... + 18323125321.

It is an arithmetic number, because the mean of its divisors is an integer number (73292501260).

Almost surely, 2^256523754403 is an apocalyptic number.

256523754403 is a deficient number, since it is larger than the sum of its proper divisors (36646250637).

256523754403 is an equidigital number, since it uses as much as digits as its factorization.

256523754403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36646250636.

The product of its (nonzero) digits is 3024000, while the sum is 46.

The spelling of 256523754403 in words is "two hundred fifty-six billion, five hundred twenty-three million, seven hundred fifty-four thousand, four hundred three".