256274104721 has 4 divisors (see below), whose sum is σ = 256689460452. Its totient is φ = 255858748992.

The previous prime is 256274104699. The next prime is 256274104727. The reversal of 256274104721 is 127401472652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 109355214721 + 146918890000 = 330689^2 + 383300^2 .

It is a cyclic number.

It is not a de Polignac number, because 256274104721 - 2²⁶ = 256206995857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256274104727) 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, 207676940 + ... + 207678173.

It is an arithmetic number, because the mean of its divisors is an integer number (64172365113).

Almost surely, 2^256274104721 is an apocalyptic number.

It is an amenable number.

256274104721 is a deficient number, since it is larger than the sum of its proper divisors (415355731).

256274104721 is an equidigital number, since it uses as much as digits as its factorization.

256274104721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415355730.

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 256274104721 in words is "two hundred fifty-six billion, two hundred seventy-four million, one hundred four thousand, seven hundred twenty-one".