165838423 has 2 divisors, whose sum is σ = 165838424. Its totient is φ = 165838422.

The previous prime is 165838397. The next prime is 165838433. The reversal of 165838423 is 324838561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165838423 - 2⁵ = 165838391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165838433) 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, 82919211 + 82919212.

It is an arithmetic number, because the mean of its divisors is an integer number (82919212).

Almost surely, 2^165838423 is an apocalyptic number.

165838423 is a deficient number, since it is larger than the sum of its proper divisors (1).

165838423 is an equidigital number, since it uses as much as digits as its factorization.

165838423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 40.

The square root of 165838423 is about 12877.8267964746. The cubic root of 165838423 is about 549.4080938017.

The spelling of 165838423 in words is "one hundred sixty-five million, eight hundred thirty-eight thousand, four hundred twenty-three".