256507133622123 has 4 divisors (see below), whose sum is σ = 342009511496168. Its totient is φ = 171004755748080.

The previous prime is 256507133622097. The next prime is 256507133622139. The reversal of 256507133622123 is 321226331705652.

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

It is not a de Polignac number, because 256507133622123 - 2¹³ = 256507133613931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256507133627123) 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, 42751188937018 + ... + 42751188937023.

It is an arithmetic number, because the mean of its divisors is an integer number (85502377874042).

Almost surely, 2^{256507133622123} is an apocalyptic number.

256507133622123 is a deficient number, since it is larger than the sum of its proper divisors (85502377874045).

256507133622123 is an equidigital number, since it uses as much as digits as its factorization.

256507133622123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85502377874044.

The product of its (nonzero) digits is 2721600, while the sum is 48.

The spelling of 256507133622123 in words is "two hundred fifty-six trillion, five hundred seven billion, one hundred thirty-three million, six hundred twenty-two thousand, one hundred twenty-three".