165658609 has 2 divisors, whose sum is σ = 165658610. Its totient is φ = 165658608.

The previous prime is 165658601. The next prime is 165658613. The reversal of 165658609 is 906856561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100000000 + 65658609 = 10000^2 + 8103^2 .

It is a cyclic number.

It is not a de Polignac number, because 165658609 - 2³ = 165658601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165658601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82829304 + 82829305.

It is an arithmetic number, because the mean of its divisors is an integer number (82829305).

Almost surely, 2^165658609 is an apocalyptic number.

It is an amenable number.

165658609 is a deficient number, since it is larger than the sum of its proper divisors (1).

165658609 is an equidigital number, since it uses as much as digits as its factorization.

165658609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 165658609 is about 12870.8433678606. The cubic root of 165658609 is about 549.2094526740.

The spelling of 165658609 in words is "one hundred sixty-five million, six hundred fifty-eight thousand, six hundred nine".