25523320553 has 4 divisors (see below), whose sum is σ = 25846400640. Its totient is φ = 25200240468.

The previous prime is 25523320541. The next prime is 25523320567. The reversal of 25523320553 is 35502332552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25523320553 - 2³⁰ = 24449578729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25523320153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161539925 + ... + 161540082.

It is an arithmetic number, because the mean of its divisors is an integer number (6461600160).

Almost surely, 2^25523320553 is an apocalyptic number.

It is an amenable number.

25523320553 is a deficient number, since it is larger than the sum of its proper divisors (323080087).

25523320553 is an equidigital number, since it uses as much as digits as its factorization.

25523320553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323080086.

The product of its (nonzero) digits is 135000, while the sum is 35.

The spelling of 25523320553 in words is "twenty-five billion, five hundred twenty-three million, three hundred twenty thousand, five hundred fifty-three".