166717949 has 2 divisors, whose sum is σ = 166717950. Its totient is φ = 166717948.

The previous prime is 166717939. The next prime is 166717981. The reversal of 166717949 is 949717661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90592324 + 76125625 = 9518^2 + 8725^2 .

It is an emirp because it is prime and its reverse (949717661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166717949 - 2⁸ = 166717693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166717897 and 166717906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166717919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83358974 + 83358975.

It is an arithmetic number, because the mean of its divisors is an integer number (83358975).

Almost surely, 2^166717949 is an apocalyptic number.

It is an amenable number.

166717949 is a deficient number, since it is larger than the sum of its proper divisors (1).

166717949 is an equidigital number, since it uses as much as digits as its factorization.

166717949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 50.

The square root of 166717949 is about 12911.9304908290. The cubic root of 166717949 is about 550.3776458723.

The spelling of 166717949 in words is "one hundred sixty-six million, seven hundred seventeen thousand, nine hundred forty-nine".