165144279217 has 2 divisors, whose sum is σ = 165144279218. Its totient is φ = 165144279216.

The previous prime is 165144279191. The next prime is 165144279227. The reversal of 165144279217 is 712972441561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92352778816 + 72791500401 = 303896^2 + 269799^2 .

It is a cyclic number.

It is not a de Polignac number, because 165144279217 - 2¹¹ = 165144277169 is a prime.

It is not a weakly prime, because it can be changed into another prime (165144279227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82572139608 + 82572139609.

It is an arithmetic number, because the mean of its divisors is an integer number (82572139609).

Almost surely, 2^165144279217 is an apocalyptic number.

It is an amenable number.

165144279217 is a deficient number, since it is larger than the sum of its proper divisors (1).

165144279217 is an equidigital number, since it uses as much as digits as its factorization.

165144279217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The spelling of 165144279217 in words is "one hundred sixty-five billion, one hundred forty-four million, two hundred seventy-nine thousand, two hundred seventeen".