25543325440 has 216 divisors, whose sum is σ = 64581439104. Its totient is φ = 9669427200.

The previous prime is 25543325411. The next prime is 25543325443. The reversal of 25543325440 is 4452334552.

It is a super-2 number, since 2×25543325440² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25543325440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25543325443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147649194 + ... + 147649366.

It is an arithmetic number, because the mean of its divisors is an integer number (298988144).

Almost surely, 2^25543325440 is an apocalyptic number.

25543325440 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 25543325440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32290719552).

25543325440 is an abundant number, since it is smaller than the sum of its proper divisors (39038113664).

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

25543325440 is an equidigital number, since it uses as much as digits as its factorization.

25543325440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 37.

Adding to 25543325440 its reverse (4452334552), we get a palindrome (29995659992).

The spelling of 25543325440 in words is "twenty-five billion, five hundred forty-three million, three hundred twenty-five thousand, four hundred forty".