166166717 has 2 divisors, whose sum is σ = 166166718. Its totient is φ = 166166716.

The previous prime is 166166711. The next prime is 166166731. The reversal of 166166717 is 717661661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132457081 + 33709636 = 11509^2 + 5806^2 .

It is a cyclic number.

It is not a de Polignac number, because 166166717 - 2⁴ = 166166701 is a prime.

It is a super-2 number, since 2×166166717² = 55222755677116178, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166166711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83083358 + 83083359.

It is an arithmetic number, because the mean of its divisors is an integer number (83083359).

Almost surely, 2^166166717 is an apocalyptic number.

It is an amenable number.

166166717 is a deficient number, since it is larger than the sum of its proper divisors (1).

166166717 is an equidigital number, since it uses as much as digits as its factorization.

166166717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 166166717 is about 12890.5669774452. The cubic root of 166166717 is about 549.7703912108.

The spelling of 166166717 in words is "one hundred sixty-six million, one hundred sixty-six thousand, seven hundred seventeen".