186664 has 8 divisors (see below), whose sum is σ = 350010. Its totient is φ = 93328.

The previous prime is 186653. The next prime is 186671. The reversal of 186664 is 466681.

It can be written as a sum of positive squares in only one way, i.e., 184900 + 1764 = 430^2 + 42^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11659 + ... + 11674.

186664 is a Friedman number, since it can be written as 6^6*4+8*(6-1), using all its digits and the basic arithmetic operations.

2¹⁸⁶⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

186664 is a deficient number, since it is larger than the sum of its proper divisors (163346).

186664 is a wasteful number, since it uses less digits than its factorization.

186664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23339 (or 23335 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 186664 is about 432.0462938158. The cubic root of 186664 is about 57.1505204008.

The spelling of 186664 in words is "one hundred eighty-six thousand, six hundred sixty-four".