256664353 has 6 divisors (see below), whose sum is σ = 282118802. Its totient is φ = 233331120.

The previous prime is 256664327. The next prime is 256664399. The reversal of 256664353 is 353466652.

It can be written as a sum of positive squares in only one way, i.e., 241243024 + 15421329 = 15532^2 + 3927^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256664353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256664323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1060476 + ... + 1060717.

Almost surely, 2^256664353 is an apocalyptic number.

It is an amenable number.

256664353 is a deficient number, since it is larger than the sum of its proper divisors (25454449).

256664353 is a wasteful number, since it uses less digits than its factorization.

256664353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121215 (or 2121204 counting only the distinct ones).

The product of its digits is 388800, while the sum is 40.

The square root of 256664353 is about 16020.7475793110. The cubic root of 256664353 is about 635.5092143781.

The spelling of 256664353 in words is "two hundred fifty-six million, six hundred sixty-four thousand, three hundred fifty-three".