256756671205 has 4 divisors (see below), whose sum is σ = 308108005452. Its totient is φ = 205405336960.

The previous prime is 256756671187. The next prime is 256756671229. The reversal of 256756671205 is 502176657652.

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 154265130756 + 102491540449 = 392766^2 + 320143^2 .

It is not a de Polignac number, because 256756671205 - 2⁵ = 256756671173 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, 25675667116 + ... + 25675667125.

It is an arithmetic number, because the mean of its divisors is an integer number (77027001363).

Almost surely, 2^256756671205 is an apocalyptic number.

It is an amenable number.

256756671205 is a deficient number, since it is larger than the sum of its proper divisors (51351334247).

256756671205 is an equidigital number, since it uses as much as digits as its factorization.

256756671205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51351334246.

The product of its (nonzero) digits is 5292000, while the sum is 52.

The spelling of 256756671205 in words is "two hundred fifty-six billion, seven hundred fifty-six million, six hundred seventy-one thousand, two hundred five".