25522643561 has 8 divisors (see below), whose sum is σ = 25998453600. Its totient is φ = 25048274400.

The previous prime is 25522643557. The next prime is 25522643569. The reversal of 25522643561 is 16534622552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25522643561 - 2² = 25522643557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25522643569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324431 + ... + 395348.

It is an arithmetic number, because the mean of its divisors is an integer number (3249806700).

Almost surely, 2^25522643561 is an apocalyptic number.

It is an amenable number.

25522643561 is a deficient number, since it is larger than the sum of its proper divisors (475810039).

25522643561 is an equidigital number, since it uses as much as digits as its factorization.

25522643561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720439.

The product of its digits is 432000, while the sum is 41.

The spelling of 25522643561 in words is "twenty-five billion, five hundred twenty-two million, six hundred forty-three thousand, five hundred sixty-one".