166791 has 8 divisors (see below), whose sum is σ = 226800. Its totient is φ = 108992.

The previous prime is 166783. The next prime is 166799. The reversal of 166791 is 197661.

166791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166783) and next prime (166799).

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

It is a cyclic number.

It is not a de Polignac number, because 166791 - 2³ = 166783 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366 + ... + 683.

It is an arithmetic number, because the mean of its divisors is an integer number (28350).

2¹⁶⁶⁷⁹¹ is an apocalyptic number.

166791 is a deficient number, since it is larger than the sum of its proper divisors (60009).

166791 is a wasteful number, since it uses less digits than its factorization.

166791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105.

The product of its digits is 2268, while the sum is 30.

The square root of 166791 is about 408.4005386872. The cubic root of 166791 is about 55.0458020674.

The spelling of 166791 in words is "one hundred sixty-six thousand, seven hundred ninety-one".