165286219409 has 2 divisors, whose sum is σ = 165286219410. Its totient is φ = 165286219408.

The previous prime is 165286219393. The next prime is 165286219411. The reversal of 165286219409 is 904912682561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161099482384 + 4186737025 = 401372^2 + 64705^2 .

It is a cyclic number.

It is not a de Polignac number, because 165286219409 - 2⁴ = 165286219393 is a prime.

Together with 165286219411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165286219459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82643109704 + 82643109705.

It is an arithmetic number, because the mean of its divisors is an integer number (82643109705).

Almost surely, 2^165286219409 is an apocalyptic number.

It is an amenable number.

165286219409 is a deficient number, since it is larger than the sum of its proper divisors (1).

165286219409 is an equidigital number, since it uses as much as digits as its factorization.

165286219409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 165286219409 in words is "one hundred sixty-five billion, two hundred eighty-six million, two hundred nineteen thousand, four hundred nine".