25151222500 has 60 divisors (see below), whose sum is σ = 55100471580. Its totient is φ = 10042240000.

The previous prime is 25151222489. The next prime is 25151222519. The reversal of 25151222500 is 522215152.

It can be written as a sum of positive squares in 10 ways, for example, as 24159728356 + 991494144 = 155434^2 + 31488^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1413660 + ... + 1431340.

It is an arithmetic number, because the mean of its divisors is an integer number (918341193).

Almost surely, 2^25151222500 is an apocalyptic number.

25151222500 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 25151222500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27550235790).

25151222500 is an abundant number, since it is smaller than the sum of its proper divisors (29949249080).

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

25151222500 is a wasteful number, since it uses less digits than its factorization.

25151222500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18274 (or 18257 counting only the distinct ones).

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

Adding to 25151222500 its reverse (522215152), we get a palindrome (25673437652).

The spelling of 25151222500 in words is "twenty-five billion, one hundred fifty-one million, two hundred twenty-two thousand, five hundred".