25666671 has 8 divisors (see below), whose sum is σ = 34634880. Its totient is φ = 16904792.

The previous prime is 25666661. The next prime is 25666679. The reversal of 25666671 is 17666652.

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

It is a cyclic number.

It is not a de Polignac number, because 25666671 - 2⁵ = 25666639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51291 + ... + 51788.

It is an arithmetic number, because the mean of its divisors is an integer number (4329360).

Almost surely, 2^25666671 is an apocalyptic number.

25666671 is a deficient number, since it is larger than the sum of its proper divisors (8968209).

25666671 is a wasteful number, since it uses less digits than its factorization.

25666671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103165.

The product of its digits is 90720, while the sum is 39.

The square root of 25666671 is about 5066.2284788588. The cubic root of 25666671 is about 294.9781502538.

The spelling of 25666671 in words is "twenty-five million, six hundred sixty-six thousand, six hundred seventy-one".