165343561 has 2 divisors, whose sum is σ = 165343562. Its totient is φ = 165343560.

The previous prime is 165343537. The next prime is 165343571.

165343561 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160503561 + 4840000 = 12669^2 + 2200^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 165343561 - 2²¹ = 163246409 is a prime.

It is not a weakly prime, because it can be changed into another prime (165343501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82671780 + 82671781.

It is an arithmetic number, because the mean of its divisors is an integer number (82671781).

Almost surely, 2^165343561 is an apocalyptic number.

It is an amenable number.

165343561 is a deficient number, since it is larger than the sum of its proper divisors (1).

165343561 is an equidigital number, since it uses as much as digits as its factorization.

165343561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 165343561 is about 12858.5987183674. The cubic root of 165343561 is about 548.8610712568.

The spelling of 165343561 in words is "one hundred sixty-five million, three hundred forty-three thousand, five hundred sixty-one".