25521343320 has 64 divisors (see below), whose sum is σ = 83524400640. Its totient is φ = 6186992000.

The previous prime is 25521343301. The next prime is 25521343321. The reversal of 25521343320 is 2334312552.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25521343321) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9665856 + ... + 9668495.

It is an arithmetic number, because the mean of its divisors is an integer number (1305068760).

Almost surely, 2^25521343320 is an apocalyptic number.

25521343320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25521343320 is an abundant number, since it is smaller than the sum of its proper divisors (58003057320).

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

25521343320 is a wasteful number, since it uses less digits than its factorization.

25521343320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19334376 (or 19334372 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 25521343320 its reverse (2334312552), we get a palindrome (27855655872).

The spelling of 25521343320 in words is "twenty-five billion, five hundred twenty-one million, three hundred forty-three thousand, three hundred twenty".