25800091008 has 64 divisors (see below), whose sum is σ = 68555505600. Its totient is φ = 8597017088.

The previous prime is 25800090991. The next prime is 25800091087. The reversal of 25800091008 is 80019000852.

It is a happy number.

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 25800091008.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1265923 + ... + 1286141.

It is an arithmetic number, because the mean of its divisors is an integer number (1071179775).

Almost surely, 2^25800091008 is an apocalyptic number.

It is an amenable number.

25800091008 is an abundant number, since it is smaller than the sum of its proper divisors (42755414592).

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

25800091008 is a wasteful number, since it uses less digits than its factorization.

25800091008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23559 (or 23547 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The spelling of 25800091008 in words is "twenty-five billion, eight hundred million, ninety-one thousand, eight".