165165443 has 4 divisors (see below), whose sum is σ = 165192288. Its totient is φ = 165138600.

The previous prime is 165165397. The next prime is 165165449. The reversal of 165165443 is 344561561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344561561 = 19 ⋅18134819.

It is a cyclic number.

It is not a de Polignac number, because 165165443 - 2²⁶ = 98056579 is a prime.

It is a super-3 number, since 3×165165443³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165165449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905 + ... + 18197.

It is an arithmetic number, because the mean of its divisors is an integer number (41298072).

Almost surely, 2^165165443 is an apocalyptic number.

165165443 is a deficient number, since it is larger than the sum of its proper divisors (26845).

165165443 is an equidigital number, since it uses as much as digits as its factorization.

165165443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26844.

The product of its digits is 43200, while the sum is 35.

The square root of 165165443 is about 12851.6708252274. The cubic root of 165165443 is about 548.6639117550.

The spelling of 165165443 in words is "one hundred sixty-five million, one hundred sixty-five thousand, four hundred forty-three".