25515105200 has 120 divisors (see below), whose sum is σ = 68885986848. Its totient is φ = 9011312640.

The previous prime is 25515105157. The next prime is 25515105211. The reversal of 25515105200 is 250151552.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 25515105200.

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, 12932 + ... + 226268.

Almost surely, 2^25515105200 is an apocalyptic number.

25515105200 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 25515105200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34442993424).

25515105200 is an abundant number, since it is smaller than the sum of its proper divisors (43370881648).

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

25515105200 is a wasteful number, since it uses less digits than its factorization.

25515105200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213391 (or 213380 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

Adding to 25515105200 its reverse (250151552), we get a palindrome (25765256752).

The spelling of 25515105200 in words is "twenty-five billion, five hundred fifteen million, one hundred five thousand, two hundred".