25525000100 has 72 divisors (see below), whose sum is σ = 57493153536. Its totient is φ = 9825840000.

The previous prime is 25525000087. The next prime is 25525000129. The reversal of 25525000100 is 100052552.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 538355 + ... + 583845.

Almost surely, 2^25525000100 is an apocalyptic number.

25525000100 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 25525000100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28746576768).

25525000100 is an abundant number, since it is smaller than the sum of its proper divisors (31968153436).

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

25525000100 is a wasteful number, since it uses less digits than its factorization.

25525000100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45717 (or 45710 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

Adding to 25525000100 its reverse (100052552), we get a palindrome (25625052652).

The spelling of 25525000100 in words is "twenty-five billion, five hundred twenty-five million, one hundred", and thus it is an aban number.