25915851952 has 80 divisors (see below), whose sum is σ = 54634003200. Its totient is φ = 11869528320.

The previous prime is 25915851931. The next prime is 25915851959.

25915851952 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 25915851952.

It is not an unprimeable number, because it can be changed into a prime (25915851959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1082253 + ... + 1105939.

It is an arithmetic number, because the mean of its divisors is an integer number (682925040).

Almost surely, 2^25915851952 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 25915851952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27317001600).

25915851952 is an abundant number, since it is smaller than the sum of its proper divisors (28718151248).

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

25915851952 is a wasteful number, since it uses less digits than its factorization.

25915851952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23834 (or 23828 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 52.

Adding to 25915851952 its product of digits (1620000), we get a palindrome (25917471952).

The spelling of 25915851952 in words is "twenty-five billion, nine hundred fifteen million, eight hundred fifty-one thousand, nine hundred fifty-two".