256914235705 has 4 divisors (see below), whose sum is σ = 308297082852. Its totient is φ = 205531388560.

The previous prime is 256914235687. The next prime is 256914235769. The reversal of 256914235705 is 507532419652.

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 85303716624 + 171610519081 = 292068^2 + 414259^2 .

It is not a de Polignac number, because 256914235705 - 2⁷ = 256914235577 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25691423566 + ... + 25691423575.

It is an arithmetic number, because the mean of its divisors is an integer number (77074270713).

Almost surely, 2^256914235705 is an apocalyptic number.

It is an amenable number.

256914235705 is a deficient number, since it is larger than the sum of its proper divisors (51382847147).

256914235705 is an equidigital number, since it uses as much as digits as its factorization.

256914235705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51382847146.

The product of its (nonzero) digits is 2268000, while the sum is 49.

The spelling of 256914235705 in words is "two hundred fifty-six billion, nine hundred fourteen million, two hundred thirty-five thousand, seven hundred five".