25978871671 has 4 divisors (see below), whose sum is σ = 26344771344. Its totient is φ = 25612972000.

The previous prime is 25978871641. The next prime is 25978871693. The reversal of 25978871671 is 17617887952.

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 25978871671 - 2⁷ = 25978871543 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 (25978871641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182949730 + ... + 182949871.

It is an arithmetic number, because the mean of its divisors is an integer number (6586192836).

Almost surely, 2^25978871671 is an apocalyptic number.

25978871671 is a deficient number, since it is larger than the sum of its proper divisors (365899673).

25978871671 is an equidigital number, since it uses as much as digits as its factorization.

25978871671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365899672.

The product of its digits is 11854080, while the sum is 61.

The spelling of 25978871671 in words is "twenty-five billion, nine hundred seventy-eight million, eight hundred seventy-one thousand, six hundred seventy-one".