256042440455 has 4 divisors (see below), whose sum is σ = 307250928552. Its totient is φ = 204833952360.

The previous prime is 256042440449. The next prime is 256042440469. The reversal of 256042440455 is 554044240652.

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

It is not a de Polignac number, because 256042440455 - 2¹⁸ = 256042178311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25604244041 + ... + 25604244050.

It is an arithmetic number, because the mean of its divisors is an integer number (76812732138).

Almost surely, 2^256042440455 is an apocalyptic number.

256042440455 is a deficient number, since it is larger than the sum of its proper divisors (51208488097).

256042440455 is an equidigital number, since it uses as much as digits as its factorization.

256042440455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51208488096.

The product of its (nonzero) digits is 768000, while the sum is 41.

The spelling of 256042440455 in words is "two hundred fifty-six billion, forty-two million, four hundred forty thousand, four hundred fifty-five".