25506004400 has 60 divisors (see below), whose sum is σ = 64882791432. Its totient is φ = 9602257920.

The previous prime is 25506004387. The next prime is 25506004441. The reversal of 25506004400 is 440060552.

It is a self number, because there is not a number n which added to its sum of digits gives 25506004400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1868642 + ... + 1882241.

Almost surely, 2^25506004400 is an apocalyptic number.

25506004400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25506004400 is an abundant number, since it is smaller than the sum of its proper divisors (39376787032).

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

25506004400 is a wasteful number, since it uses less digits than its factorization.

25506004400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3750918 (or 3750907 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 25506004400 its reverse (440060552), we get a palindrome (25946064952).

The spelling of 25506004400 in words is "twenty-five billion, five hundred six million, four thousand, four hundred".