86666 has 8 divisors (see below), whose sum is σ = 137700. Its totient is φ = 40768.

The previous prime is 86629. The next prime is 86677. The reversal of 86666 is 66668.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 73441 + 13225 = 271^2 + 115^2 .

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

86666 is a modest number, since divided by 666 gives 86 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1241 + ... + 1308.

2⁸⁶⁶⁶⁶ is an apocalyptic number.

86666 is a deficient number, since it is larger than the sum of its proper divisors (51034).

86666 is a wasteful number, since it uses less digits than its factorization.

86666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568.

The product of its digits is 10368, while the sum is 32.

The square root of 86666 is about 294.3908965984. The cubic root of 86666 is about 44.2536996705.

The spelling of 86666 in words is "eighty-six thousand, six hundred sixty-six".