166550609 has 2 divisors, whose sum is σ = 166550610. Its totient is φ = 166550608.

The previous prime is 166550597. The next prime is 166550617. The reversal of 166550609 is 906055661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153388225 + 13162384 = 12385^2 + 3628^2 .

It is a cyclic number.

It is not a de Polignac number, because 166550609 - 2⁸ = 166550353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166550669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83275304 + 83275305.

It is an arithmetic number, because the mean of its divisors is an integer number (83275305).

Almost surely, 2^166550609 is an apocalyptic number.

It is an amenable number.

166550609 is a deficient number, since it is larger than the sum of its proper divisors (1).

166550609 is an equidigital number, since it uses as much as digits as its factorization.

166550609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 166550609 is about 12905.4488104831. The cubic root of 166550609 is about 550.1934404970.

The spelling of 166550609 in words is "one hundred sixty-six million, five hundred fifty thousand, six hundred nine".