25521890432 has 32 divisors (see below), whose sum is σ = 51338052480. Its totient is φ = 12637046016.

The previous prime is 25521890431. The next prime is 25521890437. The reversal of 25521890432 is 23409812552.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 25521890432.

It is not an unprimeable number, because it can be changed into a prime (25521890431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954728 + ... + 981095.

It is an arithmetic number, because the mean of its divisors is an integer number (1604314140).

Almost surely, 2^25521890432 is an apocalyptic number.

It is an amenable number.

25521890432 is an abundant number, since it is smaller than the sum of its proper divisors (25816162048).

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

25521890432 is a wasteful number, since it uses less digits than its factorization.

25521890432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935940 (or 1935928 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 25521890432 in words is "twenty-five billion, five hundred twenty-one million, eight hundred ninety thousand, four hundred thirty-two".