166804039 has 2 divisors, whose sum is σ = 166804040. Its totient is φ = 166804038.

The previous prime is 166804019. The next prime is 166804049. The reversal of 166804039 is 930408661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166804039 - 2⁵ = 166804007 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166803989 and 166804007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166804019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83402019 + 83402020.

It is an arithmetic number, because the mean of its divisors is an integer number (83402020).

Almost surely, 2^166804039 is an apocalyptic number.

166804039 is a deficient number, since it is larger than the sum of its proper divisors (1).

166804039 is an equidigital number, since it uses as much as digits as its factorization.

166804039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 166804039 is about 12915.2637990867. The cubic root of 166804039 is about 550.4723644442.

The spelling of 166804039 in words is "one hundred sixty-six million, eight hundred four thousand, thirty-nine".