165405369 has 4 divisors (see below), whose sum is σ = 220540496. Its totient is φ = 110270244.

The previous prime is 165405353. The next prime is 165405403. The reversal of 165405369 is 963504561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 963504561 = 3 ⋅321168187.

It is not a de Polignac number, because 165405369 - 2⁴ = 165405353 is a prime.

It is a super-2 number, since 2×165405369² = 54717872188052322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165405319) 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 in 3 ways as a sum of consecutive naturals, for example, 27567559 + ... + 27567564.

It is an arithmetic number, because the mean of its divisors is an integer number (55135124).

Almost surely, 2^165405369 is an apocalyptic number.

It is an amenable number.

165405369 is a deficient number, since it is larger than the sum of its proper divisors (55135127).

165405369 is an equidigital number, since it uses as much as digits as its factorization.

165405369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55135126.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 165405369 is about 12861.0018661067. The cubic root of 165405369 is about 548.9294536775.

The spelling of 165405369 in words is "one hundred sixty-five million, four hundred five thousand, three hundred sixty-nine".