166979 has 2 divisors, whose sum is σ = 166980. Its totient is φ = 166978.

The previous prime is 166973. The next prime is 166987. The reversal of 166979 is 979661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166979 - 2⁸ = 166723 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (166973) 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 as a sum of consecutive naturals, namely, 83489 + 83490.

It is an arithmetic number, because the mean of its divisors is an integer number (83490).

2¹⁶⁶⁹⁷⁹ is an apocalyptic number.

166979 is a deficient number, since it is larger than the sum of its proper divisors (1).

166979 is an equidigital number, since it uses as much as digits as its factorization.

166979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 166979 is about 408.6306400651. The cubic root of 166979 is about 55.0664760947.

The spelling of 166979 in words is "one hundred sixty-six thousand, nine hundred seventy-nine".