25631563317871 has 16 divisors (see below), whose sum is σ = 30838193372160. Its totient is φ = 20811420050400.

The previous prime is 25631563317853. The next prime is 25631563317887. The reversal of 25631563317871 is 17871336513652.

It is not a de Polignac number, because 25631563317871 - 2⁹ = 25631563317359 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 (25631563317071) 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, 8818636 + ... + 11359201.

It is an arithmetic number, because the mean of its divisors is an integer number (1927387085760).

Almost surely, 2^{25631563317871} is an apocalyptic number.

25631563317871 is a deficient number, since it is larger than the sum of its proper divisors (5206630054289).

25631563317871 is a wasteful number, since it uses less digits than its factorization.

25631563317871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20187414.

The product of its digits is 19051200, while the sum is 58.

The spelling of 25631563317871 in words is "twenty-five trillion, six hundred thirty-one billion, five hundred sixty-three million, three hundred seventeen thousand, eight hundred seventy-one".