166690 has 16 divisors (see below), whose sum is σ = 305280. Its totient is φ = 65520.

The previous prime is 166679. The next prime is 166693. The reversal of 166690 is 96661.

It is a happy number.

It is a super-2 number, since 2×166690² = 55571112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166693) 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, 685 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (19080).

2¹⁶⁶⁶⁹⁰ is an apocalyptic number.

166690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166690 is a deficient number, since it is larger than the sum of its proper divisors (138590).

166690 is a wasteful number, since it uses less digits than its factorization.

166690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 166690 is about 408.2768668441. The cubic root of 166690 is about 55.0346888607.

The spelling of 166690 in words is "one hundred sixty-six thousand, six hundred ninety".