25502400000 has 1440 divisors, whose sum is σ = 119683339776. Its totient is φ = 5068800000.

The previous prime is 25502399999. The next prime is 25502400031. The reversal of 25502400000 is 420552.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1108799989 + ... + 1108800011.

Almost surely, 2^25502400000 is an apocalyptic number.

25502400000 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 25502400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59841669888).

25502400000 is an abundant number, since it is smaller than the sum of its proper divisors (94180939776).

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

25502400000 is an equidigital number, since it uses as much as digits as its factorization.

25502400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

Adding to 25502400000 its reverse (420552), we get a palindrome (25502820552).

The spelling of 25502400000 in words is "twenty-five billion, five hundred two million, four hundred thousand".