256641703922 has 6 divisors (see below), whose sum is σ = 384963630543. Its totient is φ = 128320493742.

The previous prime is 256641703921. The next prime is 256641703937. The reversal of 256641703922 is 229307146652.

It can be written as a sum of positive squares in only one way, i.e., 128320851961 + 128320851961 = 358219^2 + 358219^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=358219.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256641703921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 537329 + ... + 895547.

Almost surely, 2^256641703922 is an apocalyptic number.

256641703922 is a deficient number, since it is larger than the sum of its proper divisors (128321926621).

256641703922 is an frugal number, since it uses more digits than its factorization.

256641703922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716440 (or 358221 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 256641703922 in words is "two hundred fifty-six billion, six hundred forty-one million, seven hundred three thousand, nine hundred twenty-two".