25809793632 has 144 divisors (see below), whose sum is σ = 83972502432. Its totient is φ = 7366256640.

The previous prime is 25809793621. The next prime is 25809793673. The reversal of 25809793632 is 23639790852.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×25809793632² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2003532 + ... + 2016372.

It is an arithmetic number, because the mean of its divisors is an integer number (583142378).

Almost surely, 2^25809793632 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 25809793632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41986251216).

25809793632 is an abundant number, since it is smaller than the sum of its proper divisors (58162708800).

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

25809793632 is a wasteful number, since it uses less digits than its factorization.

25809793632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13861 (or 13850 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 25809793632 in words is "twenty-five billion, eight hundred nine million, seven hundred ninety-three thousand, six hundred thirty-two".