25918517888 has 64 divisors (see below), whose sum is σ = 52210878720. Its totient is φ = 12814986240.

The previous prime is 25918517887. The next prime is 25918517939. The reversal of 25918517888 is 88871581952.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 25918517888.

It is not an unprimeable number, because it can be changed into a prime (25918517887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16228706 + ... + 16230302.

It is an arithmetic number, because the mean of its divisors is an integer number (815794980).

Almost surely, 2^25918517888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25918517888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26105439360).

25918517888 is an abundant number, since it is smaller than the sum of its proper divisors (26292360832).

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

25918517888 is a wasteful number, since it uses less digits than its factorization.

25918517888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945 (or 2933 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 62.

The spelling of 25918517888 in words is "twenty-five billion, nine hundred eighteen million, five hundred seventeen thousand, eight hundred eighty-eight".