166785 has 8 divisors (see below), whose sum is σ = 266880. Its totient is φ = 88944.

The previous prime is 166783. The next prime is 166799. The reversal of 166785 is 587661.

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

It is not a de Polignac number, because 166785 - 2¹ = 166783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166781) 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, 5545 + ... + 5574.

It is an arithmetic number, because the mean of its divisors is an integer number (33360).

2¹⁶⁶⁷⁸⁵ is an apocalyptic number.

166785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166785 is a deficient number, since it is larger than the sum of its proper divisors (100095).

166785 is a wasteful number, since it uses less digits than its factorization.

166785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11127.

The product of its digits is 10080, while the sum is 33.

The square root of 166785 is about 408.3931928914. The cubic root of 166785 is about 55.0451420023.

The spelling of 166785 in words is "one hundred sixty-six thousand, seven hundred eighty-five".