25554487139 has 4 divisors (see below), whose sum is σ = 25554806856. Its totient is φ = 25554167424.

The previous prime is 25554487099. The next prime is 25554487187. The reversal of 25554487139 is 93178445552.

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 is a cyclic number.

It is not a de Polignac number, because 25554487139 - 2¹² = 25554483043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25554483139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79472 + ... + 239634.

It is an arithmetic number, because the mean of its divisors is an integer number (6388701714).

Almost surely, 2^25554487139 is an apocalyptic number.

25554487139 is a deficient number, since it is larger than the sum of its proper divisors (319717).

25554487139 is a wasteful number, since it uses less digits than its factorization.

25554487139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319716.

The product of its digits is 6048000, while the sum is 53.

The spelling of 25554487139 in words is "twenty-five billion, five hundred fifty-four million, four hundred eighty-seven thousand, one hundred thirty-nine".