25520405200 has 30 divisors (see below), whose sum is σ = 61312774454. Its totient is φ = 10208161920.

The previous prime is 25520405111. The next prime is 25520405201. The reversal of 25520405200 is 250402552.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 18870336 + 25501534864 = 4344^2 + 159692^2 .

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 (25520405201) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 31900107 + ... + 31900906.

Almost surely, 2^25520405200 is an apocalyptic number.

25520405200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25520405200 is an abundant number, since it is smaller than the sum of its proper divisors (35792369254).

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

25520405200 is a wasteful number, since it uses less digits than its factorization.

25520405200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63801031 (or 63801020 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

Adding to 25520405200 its reverse (250402552), we get a palindrome (25770807752).

The spelling of 25520405200 in words is "twenty-five billion, five hundred twenty million, four hundred five thousand, two hundred".