6666871 has 8 divisors (see below), whose sum is σ = 6803264. Its totient is φ = 6531840.

The previous prime is 6666841. The next prime is 6666883. The reversal of 6666871 is 1786666.

6666871 = T₅ + T₆ + ... + T₃₄₁.

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

It is a 8-Lehmer number, since φ(6666871) divides (6666871-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 6666871 - 2¹⁷ = 6535799 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 (6666841) 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, 19615 + ... + 19951.

It is an arithmetic number, because the mean of its divisors is an integer number (850408).

Almost surely, 2^6666871 is an apocalyptic number.

6666871 is a deficient number, since it is larger than the sum of its proper divisors (136393).

6666871 is a wasteful number, since it uses less digits than its factorization.

6666871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681.

The product of its digits is 72576, while the sum is 40.

The square root of 6666871 is about 2582.0284661483. The cubic root of 6666871 is about 188.2091286068.

The spelling of 6666871 in words is "six million, six hundred sixty-six thousand, eight hundred seventy-one".