165770219 has 2 divisors, whose sum is σ = 165770220. Its totient is φ = 165770218.

The previous prime is 165770201. The next prime is 165770221. The reversal of 165770219 is 912077561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165770219 - 2¹² = 165766123 is a prime.

It is a super-2 number, since 2×165770219² = 54959531014615922, which contains 22 as substring.

Together with 165770221, 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 (165770239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82885109 + 82885110.

It is an arithmetic number, because the mean of its divisors is an integer number (82885110).

Almost surely, 2^165770219 is an apocalyptic number.

165770219 is a deficient number, since it is larger than the sum of its proper divisors (1).

165770219 is an equidigital number, since it uses as much as digits as its factorization.

165770219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 165770219 is about 12875.1784065309. The cubic root of 165770219 is about 549.3327655251.

The spelling of 165770219 in words is "one hundred sixty-five million, seven hundred seventy thousand, two hundred nineteen".