256623463605 has 8 divisors (see below), whose sum is σ = 410597541792. Its totient is φ = 136865847248.

The previous prime is 256623463601. The next prime is 256623463609. The reversal of 256623463605 is 506364326652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256623463601) and next prime (256623463609).

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

It is a cyclic number.

It is not a de Polignac number, because 256623463605 - 2² = 256623463601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256623463601) 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, 8554115439 + ... + 8554115468.

It is an arithmetic number, because the mean of its divisors is an integer number (51324692724).

Almost surely, 2^256623463605 is an apocalyptic number.

It is an amenable number.

256623463605 is a deficient number, since it is larger than the sum of its proper divisors (153974078187).

256623463605 is a wasteful number, since it uses less digits than its factorization.

256623463605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17108230915.

The product of its (nonzero) digits is 4665600, while the sum is 48.

The spelling of 256623463605 in words is "two hundred fifty-six billion, six hundred twenty-three million, four hundred sixty-three thousand, six hundred five".