166659 has 8 divisors (see below), whose sum is σ = 225552. Its totient is φ = 109440.

The previous prime is 166657. The next prime is 166667. The reversal of 166659 is 956661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166659 - 2¹ = 166657 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (166657) 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 in 7 ways as a sum of consecutive naturals, for example, 162 + ... + 599.

It is an arithmetic number, because the mean of its divisors is an integer number (28194).

2¹⁶⁶⁶⁵⁹ is an apocalyptic number.

166659 is a deficient number, since it is larger than the sum of its proper divisors (58893).

166659 is an equidigital number, since it uses as much as digits as its factorization.

166659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

The product of its digits is 9720, while the sum is 33.

The square root of 166659 is about 408.2389006452. The cubic root of 166659 is about 55.0312769761.

The spelling of 166659 in words is "one hundred sixty-six thousand, six hundred fifty-nine".