166029209 has 2 divisors, whose sum is σ = 166029210. Its totient is φ = 166029208.

The previous prime is 166029187. The next prime is 166029223. The reversal of 166029209 is 902920661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140304025 + 25725184 = 11845^2 + 5072^2 .

It is an emirp because it is prime and its reverse (902920661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166029209 is a prime.

It is not a weakly prime, because it can be changed into another prime (166029289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83014604 + 83014605.

It is an arithmetic number, because the mean of its divisors is an integer number (83014605).

Almost surely, 2^166029209 is an apocalyptic number.

It is an amenable number.

166029209 is a deficient number, since it is larger than the sum of its proper divisors (1).

166029209 is an equidigital number, since it uses as much as digits as its factorization.

166029209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 166029209 is about 12885.2322059015. The cubic root of 166029209 is about 549.6186987999.

The spelling of 166029209 in words is "one hundred sixty-six million, twenty-nine thousand, two hundred nine".