256507510054565 has 32 divisors (see below), whose sum is σ = 400447184541696. Its totient is φ = 152948577418560.

The previous prime is 256507510054559. The next prime is 256507510054571. The reversal of 256507510054565 is 565450015705652.

It is an interprime number because it is at equal distance from previous prime (256507510054559) and next prime (256507510054571).

It is not a de Polignac number, because 256507510054565 - 2¹⁴ = 256507510038181 is a prime.

It is a super-2 number, since 2×256507510054565² (a number of 30 digits) contains 22 as substring.

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 256507510054565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14483757947 + ... + 14483775656.

It is an arithmetic number, because the mean of its divisors is an integer number (12513974516928).

Almost surely, 2^{256507510054565} is an apocalyptic number.

It is an amenable number.

256507510054565 is a deficient number, since it is larger than the sum of its proper divisors (143939674487131).

256507510054565 is a wasteful number, since it uses less digits than its factorization.

256507510054565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28967533649.

The product of its (nonzero) digits is 31500000, while the sum is 56.

The spelling of 256507510054565 in words is "two hundred fifty-six trillion, five hundred seven billion, five hundred ten million, fifty-four thousand, five hundred sixty-five".