26256881951565 has 32 divisors (see below), whose sum is σ = 42587477412480. Its totient is φ = 13811523710976.

The previous prime is 26256881951537. The next prime is 26256881951603. The reversal of 26256881951565 is 56515918865262.

It is not a de Polignac number, because 26256881951565 - 2⁶ = 26256881951501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26256881951565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52276114 + ... + 52775996.

It is an arithmetic number, because the mean of its divisors is an integer number (1330858669140).

Almost surely, 2^{26256881951565} is an apocalyptic number.

It is an amenable number.

26256881951565 is a deficient number, since it is larger than the sum of its proper divisors (16330595460915).

26256881951565 is a wasteful number, since it uses less digits than its factorization.

26256881951565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547933.

The product of its digits is 311040000, while the sum is 69.

The spelling of 26256881951565 in words is "twenty-six trillion, two hundred fifty-six billion, eight hundred eighty-one million, nine hundred fifty-one thousand, five hundred sixty-five".