256606500565 has 8 divisors (see below), whose sum is σ = 307930521600. Its totient is φ = 205283386512.

The previous prime is 256606500547. The next prime is 256606500569. The reversal of 256606500565 is 565005606652.

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 256606500565 - 2⁹ = 256606500053 is a prime.

It is a super-2 number, since 2×256606500565² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256606500569) 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, 967852 + ... + 1204138.

It is an arithmetic number, because the mean of its divisors is an integer number (38491315200).

Almost surely, 2^256606500565 is an apocalyptic number.

It is an amenable number.

256606500565 is a deficient number, since it is larger than the sum of its proper divisors (51324021035).

256606500565 is a wasteful number, since it uses less digits than its factorization.

256606500565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453491.

The product of its (nonzero) digits is 1620000, while the sum is 46.

The spelling of 256606500565 in words is "two hundred fifty-six billion, six hundred six million, five hundred thousand, five hundred sixty-five".