166864 has 10 divisors (see below), whose sum is σ = 323330. Its totient is φ = 83424.

The previous prime is 166861. The next prime is 166867. The reversal of 166864 is 468661.

It is an interprime number because it is at equal distance from previous prime (166861) and next prime (166867).

It can be written as a sum of positive squares in only one way, i.e., 166464 + 400 = 408^2 + 20^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5199 + ... + 5230.

It is an arithmetic number, because the mean of its divisors is an integer number (32333).

2¹⁶⁶⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

166864 is a deficient number, since it is larger than the sum of its proper divisors (156466).

166864 is a wasteful number, since it uses less digits than its factorization.

166864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10437 (or 10431 counting only the distinct ones).

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

The square root of 166864 is about 408.4899019560. The cubic root of 166864 is about 55.0538315923.

The spelling of 166864 in words is "one hundred sixty-six thousand, eight hundred sixty-four".