256611545674201 has 4 divisors (see below), whose sum is σ = 256611620739600. Its totient is φ = 256611470608804.

The previous prime is 256611545674189. The next prime is 256611545674207. The reversal of 256611545674201 is 102476545116652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256611545674201 - 2²¹ = 256611543577049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256611545674207) 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, 32147371 + ... + 39327808.

It is an arithmetic number, because the mean of its divisors is an integer number (64152905184900).

Almost surely, 2^{256611545674201} is an apocalyptic number.

It is an amenable number.

256611545674201 is a deficient number, since it is larger than the sum of its proper divisors (75065399).

256611545674201 is an equidigital number, since it uses as much as digits as its factorization.

256611545674201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75065398.

The product of its (nonzero) digits is 12096000, while the sum is 55.

The spelling of 256611545674201 in words is "two hundred fifty-six trillion, six hundred eleven billion, five hundred forty-five million, six hundred seventy-four thousand, two hundred one".