25546587889 has 3 divisors (see below), whose sum is σ = 25546747723. Its totient is φ = 25546428056.

The previous prime is 25546587863. The next prime is 25546587893. The reversal of 25546587889 is 98878564552.

The square root of 25546587889 is 159833.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 140778225 + 25405809664 = 11865^2 + 159392^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25546587889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25546587839) 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 2 ways as a sum of consecutive naturals, for example, 79917 + ... + 239749.

Almost surely, 2^25546587889 is an apocalyptic number.

25546587889 is the 159833-rd square number.

25546587889 is the 79917-th centered octagonal number.

It is an amenable number.

25546587889 is a deficient number, since it is larger than the sum of its proper divisors (159834).

25546587889 is an frugal number, since it uses more digits than its factorization.

25546587889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319666 (or 159833 counting only the distinct ones).

The product of its digits is 193536000, while the sum is 67.

The spelling of 25546587889 in words is "twenty-five billion, five hundred forty-six million, five hundred eighty-seven thousand, eight hundred eighty-nine".