166983 has 4 divisors (see below), whose sum is σ = 222648. Its totient is φ = 111320.

The previous prime is 166979. The next prime is 166987. The reversal of 166983 is 389661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389661 = 3 ⋅129887.

It is an interprime number because it is at equal distance from previous prime (166979) and next prime (166987).

It is a cyclic number.

It is not a de Polignac number, because 166983 - 2² = 166979 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166987) 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, 27828 + ... + 27833.

It is an arithmetic number, because the mean of its divisors is an integer number (55662).

2¹⁶⁶⁹⁸³ is an apocalyptic number.

166983 is a deficient number, since it is larger than the sum of its proper divisors (55665).

166983 is an equidigital number, since it uses as much as digits as its factorization.

166983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55664.

The product of its digits is 7776, while the sum is 33.

The square root of 166983 is about 408.6355344314. The cubic root of 166983 is about 55.0669157990.

The spelling of 166983 in words is "one hundred sixty-six thousand, nine hundred eighty-three".