166610009 has 2 divisors, whose sum is σ = 166610010. Its totient is φ = 166610008.

The previous prime is 166609997. The next prime is 166610011. The reversal of 166610009 is 900016661.

166610009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112954384 + 53655625 = 10628^2 + 7325^2 .

It is a cyclic number.

It is not a de Polignac number, because 166610009 - 2⁸ = 166609753 is a prime.

Together with 166610011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166610029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83305004 + 83305005.

It is an arithmetic number, because the mean of its divisors is an integer number (83305005).

Almost surely, 2^166610009 is an apocalyptic number.

It is an amenable number.

166610009 is a deficient number, since it is larger than the sum of its proper divisors (1).

166610009 is an equidigital number, since it uses as much as digits as its factorization.

166610009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 166610009 is about 12907.7499588426. The cubic root of 166610009 is about 550.2588412503.

The spelling of 166610009 in words is "one hundred sixty-six million, six hundred ten thousand, nine".