165050506616509 has 2 divisors, whose sum is σ = 165050506616510. Its totient is φ = 165050506616508.

The previous prime is 165050506616483. The next prime is 165050506616551. The reversal of 165050506616509 is 905616605050561.

165050506616509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116553140976484 + 48497365640025 = 10795978^2 + 6964005^2 .

It is an emirp because it is prime and its reverse (905616605050561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165050506616509 - 2¹⁵ = 165050506583741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165050506616509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165050506616209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82525253308254 + 82525253308255.

It is an arithmetic number, because the mean of its divisors is an integer number (82525253308255).

Almost surely, 2^{165050506616509} is an apocalyptic number.

It is an amenable number.

165050506616509 is a deficient number, since it is larger than the sum of its proper divisors (1).

165050506616509 is an equidigital number, since it uses as much as digits as its factorization.

165050506616509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290000, while the sum is 55.

The spelling of 165050506616509 in words is "one hundred sixty-five trillion, fifty billion, five hundred six million, six hundred sixteen thousand, five hundred nine".