666164 has 6 divisors (see below), whose sum is σ = 1165794. Its totient is φ = 333080.

The previous prime is 666143. The next prime is 666167. The reversal of 666164 is 461666.

It can be written as a sum of positive squares in only one way, i.e., 550564 + 115600 = 742^2 + 340^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83267 + ... + 83274.

It is an arithmetic number, because the mean of its divisors is an integer number (194299).

2⁶⁶⁶¹⁶⁴ is an apocalyptic number.

It is an amenable number.

666164 is a deficient number, since it is larger than the sum of its proper divisors (499630).

666164 is a wasteful number, since it uses less digits than its factorization.

666164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166545 (or 166543 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 666164 is about 816.1887036709. The cubic root of 666164 is about 87.3360849640.

The spelling of 666164 in words is "six hundred sixty-six thousand, one hundred sixty-four".