25564646552 has 32 divisors (see below), whose sum is σ = 49070292480. Its totient is φ = 12479500320.

The previous prime is 25564646449. The next prime is 25564646557.

25564646552 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 25564646552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25564646557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 818177 + ... + 848847.

It is an arithmetic number, because the mean of its divisors is an integer number (1533446640).

Almost surely, 2^25564646552 is an apocalyptic number.

It is an amenable number.

25564646552 is a deficient number, since it is larger than the sum of its proper divisors (23505645928).

25564646552 is a wasteful number, since it uses less digits than its factorization.

25564646552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33143 (or 33139 counting only the distinct ones).

The product of its digits is 8640000, while the sum is 50.

The spelling of 25564646552 in words is "twenty-five billion, five hundred sixty-four million, six hundred forty-six thousand, five hundred fifty-two".