166706609 has 2 divisors, whose sum is σ = 166706610. Its totient is φ = 166706608.

The previous prime is 166706597. The next prime is 166706647. The reversal of 166706609 is 906607661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159946609 + 6760000 = 12647^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 166706609 - 2⁴ = 166706593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166706699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83353304 + 83353305.

It is an arithmetic number, because the mean of its divisors is an integer number (83353305).

Almost surely, 2^166706609 is an apocalyptic number.

It is an amenable number.

166706609 is a deficient number, since it is larger than the sum of its proper divisors (1).

166706609 is an equidigital number, since it uses as much as digits as its factorization.

166706609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 166706609 is about 12911.4913546035. The cubic root of 166706609 is about 550.3651668639.

The spelling of 166706609 in words is "one hundred sixty-six million, seven hundred six thousand, six hundred nine".