25252521252 has 96 divisors (see below), whose sum is σ = 68531334144. Its totient is φ = 7088342400.

The previous prime is 25252521241. The next prime is 25252521257. The reversal of 25252521252 is 25212525252.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (25252521257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1251927 + ... + 1271937.

It is an arithmetic number, because the mean of its divisors is an integer number (713868064).

Almost surely, 2^25252521252 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 25252521252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34265667072).

25252521252 is an abundant number, since it is smaller than the sum of its proper divisors (43278812892).

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

25252521252 is a wasteful number, since it uses less digits than its factorization.

25252521252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20289 (or 20287 counting only the distinct ones).

The product of its digits is 40000, while the sum is 33.

The spelling of 25252521252 in words is "twenty-five billion, two hundred fifty-two million, five hundred twenty-one thousand, two hundred fifty-two".