256356233171 has 8 divisors (see below), whose sum is σ = 256482758640. Its totient is φ = 256229747712.

The previous prime is 256356233143. The next prime is 256356233239. The reversal of 256356233171 is 171332653652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256356233171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256356233671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26579876 + ... + 26589518.

It is an arithmetic number, because the mean of its divisors is an integer number (32060344830).

Almost surely, 2^256356233171 is an apocalyptic number.

256356233171 is a deficient number, since it is larger than the sum of its proper divisors (126525469).

256356233171 is an equidigital number, since it uses as much as digits as its factorization.

256356233171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20005.

The product of its digits is 680400, while the sum is 44.

The spelling of 256356233171 in words is "two hundred fifty-six billion, three hundred fifty-six million, two hundred thirty-three thousand, one hundred seventy-one".