25564318568 has 8 divisors (see below), whose sum is σ = 47933097330. Its totient is φ = 12782159280.

The previous prime is 25564318561. The next prime is 25564318613. The reversal of 25564318568 is 86581346552.

It can be written as a sum of positive squares in only one way, i.e., 22589488804 + 2974829764 = 150298^2 + 54542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (25564318561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1597769903 + ... + 1597769918.

Almost surely, 2^25564318568 is an apocalyptic number.

It is an amenable number.

25564318568 is a deficient number, since it is larger than the sum of its proper divisors (22368778762).

25564318568 is a wasteful number, since it uses less digits than its factorization.

25564318568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195539827 (or 3195539823 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 53.

The spelling of 25564318568 in words is "twenty-five billion, five hundred sixty-four million, three hundred eighteen thousand, five hundred sixty-eight".