166739 has 2 divisors, whose sum is σ = 166740. Its totient is φ = 166738.

The previous prime is 166723. The next prime is 166741. The reversal of 166739 is 937661.

166739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (937661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166739 - 2⁴ = 166723 is a prime.

It is a Sophie Germain prime.

Together with 166741, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (166799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83369 + 83370.

It is an arithmetic number, because the mean of its divisors is an integer number (83370).

2¹⁶⁶⁷³⁹ is an apocalyptic number.

166739 is a deficient number, since it is larger than the sum of its proper divisors (1).

166739 is an equidigital number, since it uses as much as digits as its factorization.

166739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 32.

The square root of 166739 is about 408.3368707330. The cubic root of 166739 is about 55.0400809769.

The spelling of 166739 in words is "one hundred sixty-six thousand, seven hundred thirty-nine".