25805525828 has 12 divisors (see below), whose sum is σ = 46380202092. Its totient is φ = 12554039520.

The previous prime is 25805525813. The next prime is 25805525861. The reversal of 25805525828 is 82852550852.

It can be written as a sum of positive squares in 2 ways, for example, as 20435274304 + 5370251524 = 142952^2 + 73282^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87180683 + ... + 87180978.

It is an arithmetic number, because the mean of its divisors is an integer number (3865016841).

Almost surely, 2^25805525828 is an apocalyptic number.

It is an amenable number.

25805525828 is a deficient number, since it is larger than the sum of its proper divisors (20574676264).

25805525828 is a wasteful number, since it uses less digits than its factorization.

25805525828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174361702 (or 174361700 counting only the distinct ones).

The product of its (nonzero) digits is 2560000, while the sum is 50.

The spelling of 25805525828 in words is "twenty-five billion, eight hundred five million, five hundred twenty-five thousand, eight hundred twenty-eight".