166403173 has 2 divisors, whose sum is σ = 166403174. Its totient is φ = 166403172.

The previous prime is 166403129. The next prime is 166403177. The reversal of 166403173 is 371304661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100841764 + 65561409 = 10042^2 + 8097^2 .

It is a cyclic number.

It is not a de Polignac number, because 166403173 - 2⁹ = 166402661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166403177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83201586 + 83201587.

It is an arithmetic number, because the mean of its divisors is an integer number (83201587).

Almost surely, 2^166403173 is an apocalyptic number.

It is an amenable number.

166403173 is a deficient number, since it is larger than the sum of its proper divisors (1).

166403173 is an equidigital number, since it uses as much as digits as its factorization.

166403173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 166403173 is about 12899.7353848829. The cubic root of 166403173 is about 550.0310428760.

The spelling of 166403173 in words is "one hundred sixty-six million, four hundred three thousand, one hundred seventy-three".