165779489 has 2 divisors, whose sum is σ = 165779490. Its totient is φ = 165779488.

The previous prime is 165779447. The next prime is 165779501. The reversal of 165779489 is 984977561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157753600 + 8025889 = 12560^2 + 2833^2 .

It is an emirp because it is prime and its reverse (984977561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165779489 is a prime.

It is a super-2 number, since 2×165779489² = 54965677946202242, which contains 22 as substring.

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 (165779429) 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, 82889744 + 82889745.

It is an arithmetic number, because the mean of its divisors is an integer number (82889745).

Almost surely, 2^165779489 is an apocalyptic number.

It is an amenable number.

165779489 is a deficient number, since it is larger than the sum of its proper divisors (1).

165779489 is an equidigital number, since it uses as much as digits as its factorization.

165779489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The square root of 165779489 is about 12875.5383965099. The cubic root of 165779489 is about 549.3430050398.

The spelling of 165779489 in words is "one hundred sixty-five million, seven hundred seventy-nine thousand, four hundred eighty-nine".