166641 has 4 divisors (see below), whose sum is σ = 222192. Its totient is φ = 111092.

The previous prime is 166631. The next prime is 166643. The reversal of 166641 is 146661.

166641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166641 - 2⁵ = 166609 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27771 + ... + 27776.

It is an arithmetic number, because the mean of its divisors is an integer number (55548).

2¹⁶⁶⁶⁴¹ is an apocalyptic number.

It is an amenable number.

166641 is a deficient number, since it is larger than the sum of its proper divisors (55551).

166641 is an equidigital number, since it uses as much as digits as its factorization.

166641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55550.

The product of its digits is 864, while the sum is 24.

The square root of 166641 is about 408.2168541352. The cubic root of 166641 is about 55.0292956877.

The spelling of 166641 in words is "one hundred sixty-six thousand, six hundred forty-one".