25681317087885 has 8 divisors (see below), whose sum is σ = 41090107340640. Its totient is φ = 13696702446864.

The previous prime is 25681317087863. The next prime is 25681317087889. The reversal of 25681317087885 is 58878071318652.

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

It is not a de Polignac number, because 25681317087885 - 2¹⁸ = 25681316825741 is a prime.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25681317087889) 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 7 ways as a sum of consecutive naturals, for example, 856043902915 + ... + 856043902944.

It is an arithmetic number, because the mean of its divisors is an integer number (5136263417580).

Almost surely, 2^{25681317087885} is an apocalyptic number.

It is an amenable number.

25681317087885 is a deficient number, since it is larger than the sum of its proper divisors (15408790252755).

25681317087885 is a wasteful number, since it uses less digits than its factorization.

25681317087885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712087805867.

The product of its (nonzero) digits is 180633600, while the sum is 69.

The spelling of 25681317087885 in words is "twenty-five trillion, six hundred eighty-one billion, three hundred seventeen million, eighty-seven thousand, eight hundred eighty-five".