166564 has 6 divisors (see below), whose sum is σ = 291494. Its totient is φ = 83280.

The previous prime is 166561. The next prime is 166567. The reversal of 166564 is 465661.

It is an interprime number because it is at equal distance from previous prime (166561) and next prime (166567).

It can be written as a sum of positive squares in only one way, i.e., 166464 + 100 = 408^2 + 10^2 .

It is not an unprimeable number, because it can be changed into a prime (166561) by changing a digit.

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 as a sum of consecutive naturals, namely, 20817 + ... + 20824.

2¹⁶⁶⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

166564 is a deficient number, since it is larger than the sum of its proper divisors (124930).

166564 is a wasteful number, since it uses less digits than its factorization.

166564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41645 (or 41643 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 166564 is about 408.1225306204. The cubic root of 166564 is about 55.0208185651.

The spelling of 166564 in words is "one hundred sixty-six thousand, five hundred sixty-four".