25838665336 has 64 divisors (see below), whose sum is σ = 55278961920. Its totient is φ = 11207877120.

The previous prime is 25838665291. The next prime is 25838665351. The reversal of 25838665336 is 63356683852.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 861651 + ... + 891133.

It is an arithmetic number, because the mean of its divisors is an integer number (863733780).

Almost surely, 2^25838665336 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 25838665336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27639480960).

25838665336 is an abundant number, since it is smaller than the sum of its proper divisors (29440296584).

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

25838665336 is a wasteful number, since it uses less digits than its factorization.

25838665336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29956 (or 29952 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 55.

The spelling of 25838665336 in words is "twenty-five billion, eight hundred thirty-eight million, six hundred sixty-five thousand, three hundred thirty-six".