25861671 has 12 divisors (see below), whose sum is σ = 40751880. Its totient is φ = 15673680.

The previous prime is 25861669. The next prime is 25861687. The reversal of 25861671 is 17616852.

25861671 is a `hidden beast` number, since 2 + 586 + 1 + 6 + 71 = 666.

It is not a de Polignac number, because 25861671 - 2¹ = 25861669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25861691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130516 + ... + 130713.

It is an arithmetic number, because the mean of its divisors is an integer number (3395990).

Almost surely, 2^25861671 is an apocalyptic number.

25861671 is a deficient number, since it is larger than the sum of its proper divisors (14890209).

25861671 is a wasteful number, since it uses less digits than its factorization.

25861671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261246 (or 261243 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 25861671 is about 5085.4371493511. The cubic root of 25861671 is about 295.7232888508.

The spelling of 25861671 in words is "twenty-five million, eight hundred sixty-one thousand, six hundred seventy-one".