165816593 has 2 divisors, whose sum is σ = 165816594. Its totient is φ = 165816592.

The previous prime is 165816583. The next prime is 165816601. The reversal of 165816593 is 395618561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91718929 + 74097664 = 9577^2 + 8608^2 .

It is a cyclic number.

It is not a de Polignac number, because 165816593 - 2⁸ = 165816337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (165816583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82908296 + 82908297.

It is an arithmetic number, because the mean of its divisors is an integer number (82908297).

Almost surely, 2^165816593 is an apocalyptic number.

It is an amenable number.

165816593 is a deficient number, since it is larger than the sum of its proper divisors (1).

165816593 is an equidigital number, since it uses as much as digits as its factorization.

165816593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The square root of 165816593 is about 12876.9791876822. The cubic root of 165816593 is about 549.3839857878.

The spelling of 165816593 in words is "one hundred sixty-five million, eight hundred sixteen thousand, five hundred ninety-three".