165165311 has 4 divisors (see below), whose sum is σ = 165268824. Its totient is φ = 165061800.

The previous prime is 165165293. The next prime is 165165313. The reversal of 165165311 is 113561561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113561561 = 107 ⋅1061323.

It is a cyclic number.

It is not a de Polignac number, because 165165311 - 2¹⁰ = 165164287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165165313) 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, 49325 + ... + 52566.

It is an arithmetic number, because the mean of its divisors is an integer number (41317206).

Almost surely, 2^165165311 is an apocalyptic number.

165165311 is a deficient number, since it is larger than the sum of its proper divisors (103513).

165165311 is a wasteful number, since it uses less digits than its factorization.

165165311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103512.

The product of its digits is 2700, while the sum is 29.

The square root of 165165311 is about 12851.6656897073. The cubic root of 165165311 is about 548.6637655911.

It can be divided in two parts, 165165 and 311, that multiplied together give a palindrome (51366315).

The spelling of 165165311 in words is "one hundred sixty-five million, one hundred sixty-five thousand, three hundred eleven".