163666 has 16 divisors (see below), whose sum is σ = 266400. Its totient is φ = 75168.

The previous prime is 163661. The next prime is 163673. The reversal of 163666 is 666361.

It is not an unprimeable number, because it can be changed into a prime (163661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2206 + ... + 2278.

It is an arithmetic number, because the mean of its divisors is an integer number (16650).

2¹⁶³⁶⁶⁶ is an apocalyptic number.

163666 is a deficient number, since it is larger than the sum of its proper divisors (102734).

163666 is a wasteful number, since it uses less digits than its factorization.

163666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153.

The product of its digits is 3888, while the sum is 28.

The square root of 163666 is about 404.5565473454. The cubic root of 163666 is about 54.6998526110.

The spelling of 163666 in words is "one hundred sixty-three thousand, six hundred sixty-six".