256535663 has 4 divisors (see below), whose sum is σ = 270037560. Its totient is φ = 243033768.

The previous prime is 256535641. The next prime is 256535677. The reversal of 256535663 is 366535652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256535663 - 2¹⁸ = 256273519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256535663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256535693) by changing a digit.

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, 6750920 + ... + 6750957.

It is an arithmetic number, because the mean of its divisors is an integer number (67509390).

Almost surely, 2^256535663 is an apocalyptic number.

256535663 is a deficient number, since it is larger than the sum of its proper divisors (13501897).

256535663 is a wasteful number, since it uses less digits than its factorization.

256535663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13501896.

The product of its digits is 486000, while the sum is 41.

The square root of 256535663 is about 16016.7307213426. The cubic root of 256535663 is about 635.4029830916.

The spelling of 256535663 in words is "two hundred fifty-six million, five hundred thirty-five thousand, six hundred sixty-three".