256517300231565 has 8 divisors (see below), whose sum is σ = 410427680370528. Its totient is φ = 136809226790160.

The previous prime is 256517300231513. The next prime is 256517300231653. The reversal of 256517300231565 is 565132003715652.

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

It is not a de Polignac number, because 256517300231565 - 2¹⁴ = 256517300215181 is a prime.

It is a super-2 number, since 2×256517300231565² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8550576674371 + ... + 8550576674400.

It is an arithmetic number, because the mean of its divisors is an integer number (51303460046316).

Almost surely, 2^{256517300231565} is an apocalyptic number.

It is an amenable number.

256517300231565 is a deficient number, since it is larger than the sum of its proper divisors (153910380138963).

256517300231565 is a wasteful number, since it uses less digits than its factorization.

256517300231565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17101153348779.

The product of its (nonzero) digits is 5670000, while the sum is 51.

The spelling of 256517300231565 in words is "two hundred fifty-six trillion, five hundred seventeen billion, three hundred million, two hundred thirty-one thousand, five hundred sixty-five".