25564007765 has 16 divisors (see below), whose sum is σ = 31083686400. Its totient is φ = 20180264832.

The previous prime is 25564007717. The next prime is 25564007801. The reversal of 25564007765 is 56770046552.

It is a cyclic number.

It is not a de Polignac number, because 25564007765 - 2¹⁴ = 25563991381 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 673976 + ... + 710894.

It is an arithmetic number, because the mean of its divisors is an integer number (1942730400).

Almost surely, 2^25564007765 is an apocalyptic number.

It is an amenable number.

25564007765 is a deficient number, since it is larger than the sum of its proper divisors (5519678635).

25564007765 is a wasteful number, since it uses less digits than its factorization.

25564007765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38756.

The product of its (nonzero) digits is 1764000, while the sum is 47.

The spelling of 25564007765 in words is "twenty-five billion, five hundred sixty-four million, seven thousand, seven hundred sixty-five".