25515122200 has 96 divisors (see below), whose sum is σ = 62526913200. Its totient is φ = 9668072960.

The previous prime is 25515122179. The next prime is 25515122203. The reversal of 25515122200 is 222151552.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25515122203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265899 + ... + 348901.

Almost surely, 2^25515122200 is an apocalyptic number.

25515122200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25515122200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31263456600).

25515122200 is an abundant number, since it is smaller than the sum of its proper divisors (37011791000).

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

25515122200 is a wasteful number, since it uses less digits than its factorization.

25515122200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83101 (or 83092 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 25515122200 its reverse (222151552), we get a palindrome (25737273752).

The spelling of 25515122200 in words is "twenty-five billion, five hundred fifteen million, one hundred twenty-two thousand, two hundred".