25978111487 has 4 divisors (see below), whose sum is σ = 25979448096. Its totient is φ = 25976774880.

The previous prime is 25978111483. The next prime is 25978111499. The reversal of 25978111487 is 78411187952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25978111487 - 2² = 25978111483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25978111483) 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, 638714 + ... + 678167.

It is an arithmetic number, because the mean of its divisors is an integer number (6494862024).

Almost surely, 2^25978111487 is an apocalyptic number.

25978111487 is a deficient number, since it is larger than the sum of its proper divisors (1336609).

25978111487 is a wasteful number, since it uses less digits than its factorization.

25978111487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336608.

The product of its digits is 1128960, while the sum is 53.

The spelling of 25978111487 in words is "twenty-five billion, nine hundred seventy-eight million, one hundred eleven thousand, four hundred eighty-seven".