25561216552 has 16 divisors (see below), whose sum is σ = 48401810100. Its totient is φ = 12654067200.

The previous prime is 25561216547. The next prime is 25561216601.

25561216552 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 16955685796 + 8605530756 = 130214^2 + 92766^2 .

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 15816777 + ... + 15818392.

Almost surely, 2^25561216552 is an apocalyptic number.

It is an amenable number.

25561216552 is a deficient number, since it is larger than the sum of its proper divisors (22840593548).

25561216552 is a wasteful number, since it uses less digits than its factorization.

25561216552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31635276 (or 31635272 counting only the distinct ones).

The product of its digits is 180000, while the sum is 40.

The spelling of 25561216552 in words is "twenty-five billion, five hundred sixty-one million, two hundred sixteen thousand, five hundred fifty-two".