666886 has 8 divisors (see below), whose sum is σ = 1091304. Its totient is φ = 303120.

The previous prime is 666871. The next prime is 666889. The reversal of 666886 is 688666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666889) 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, 15135 + ... + 15178.

It is an arithmetic number, because the mean of its divisors is an integer number (136413).

2⁶⁶⁶⁸⁸⁶ is an apocalyptic number.

666886 is a deficient number, since it is larger than the sum of its proper divisors (424418).

666886 is a wasteful number, since it uses less digits than its factorization.

666886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30326.

The product of its digits is 82944, while the sum is 40.

The square root of 666886 is about 816.6308835698. The cubic root of 666886 is about 87.3676256889.

The spelling of 666886 in words is "six hundred sixty-six thousand, eight hundred eighty-six".