25565409056 has 48 divisors (see below), whose sum is σ = 54928601280. Its totient is φ = 11616180480.

The previous prime is 25565409053. The next prime is 25565409139. The reversal of 25565409056 is 65090456552.

It is a super-2 number, since 2×25565409056² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25565409056.

It is not an unprimeable number, because it can be changed into a prime (25565409053) 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, 1011485 + ... + 1036451.

It is an arithmetic number, because the mean of its divisors is an integer number (1144345860).

Almost surely, 2^25565409056 is an apocalyptic number.

It is an amenable number.

25565409056 is an abundant number, since it is smaller than the sum of its proper divisors (29363192224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25565409056 is a wasteful number, since it uses less digits than its factorization.

25565409056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27897 (or 27889 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 25565409056 in words is "twenty-five billion, five hundred sixty-five million, four hundred nine thousand, fifty-six".