25550400000 has 240 divisors, whose sum is σ = 85095366048. Its totient is φ = 6812160000.

The previous prime is 25550399999. The next prime is 25550400047. The reversal of 25550400000 is 405552.

It is a tau number, because it is divible by the number of its divisors (240).

It is a self number, because there is not a number n which added to its sum of digits gives 25550400000.

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, 4797339 + ... + 4802661.

Almost surely, 2^25550400000 is an apocalyptic number.

25550400000 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 25550400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42547683024).

25550400000 is an abundant number, since it is smaller than the sum of its proper divisors (59544966048).

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

25550400000 is an frugal number, since it uses more digits than its factorization.

25550400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369 (or 5333 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

Adding to 25550400000 its reverse (405552), we get a palindrome (25550805552).

The spelling of 25550400000 in words is "twenty-five billion, five hundred fifty million, four hundred thousand".