25564312400 has 60 divisors (see below), whose sum is σ = 67001750304. Its totient is φ = 9296112000.

The previous prime is 25564312391. The next prime is 25564312439. The reversal of 25564312400 is 421346552.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 2900636 + ... + 2909435.

Almost surely, 2^25564312400 is an apocalyptic number.

25564312400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25564312400 is an abundant number, since it is smaller than the sum of its proper divisors (41437437904).

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

25564312400 is a wasteful number, since it uses less digits than its factorization.

25564312400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5810100 (or 5810089 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 25564312400 its reverse (421346552), we get a palindrome (25985658952).

The spelling of 25564312400 in words is "twenty-five billion, five hundred sixty-four million, three hundred twelve thousand, four hundred".