25442328561 has 16 divisors (see below), whose sum is σ = 36535968000. Its totient is φ = 15655363200.

The previous prime is 25442328553. The next prime is 25442328607. The reversal of 25442328561 is 16582324452.

It is not a de Polignac number, because 25442328561 - 2³ = 25442328553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25442328551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522661 + ... + 569261.

It is an arithmetic number, because the mean of its divisors is an integer number (2283498000).

Almost surely, 2^25442328561 is an apocalyptic number.

It is an amenable number.

25442328561 is a deficient number, since it is larger than the sum of its proper divisors (11093639439).

25442328561 is a wasteful number, since it uses less digits than its factorization.

25442328561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60616.

The product of its digits is 460800, while the sum is 42.

The spelling of 25442328561 in words is "twenty-five billion, four hundred forty-two million, three hundred twenty-eight thousand, five hundred sixty-one".