256642234735423 has 4 divisors (see below), whose sum is σ = 256668932158408. Its totient is φ = 256615537312440.

The previous prime is 256642234735387. The next prime is 256642234735529. The reversal of 256642234735423 is 324537432246652.

It is a happy number.

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 256642234735423 - 2²⁹ = 256641697864511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256642234735123) 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, 13348697073 + ... + 13348716298.

It is an arithmetic number, because the mean of its divisors is an integer number (64167233039602).

Almost surely, 2^{256642234735423} is an apocalyptic number.

256642234735423 is a deficient number, since it is larger than the sum of its proper divisors (26697422985).

256642234735423 is an equidigital number, since it uses as much as digits as its factorization.

256642234735423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26697422984.

The product of its digits is 174182400, while the sum is 58.

The spelling of 256642234735423 in words is "two hundred fifty-six trillion, six hundred forty-two billion, two hundred thirty-four million, seven hundred thirty-five thousand, four hundred twenty-three".