165124165 has 4 divisors (see below), whose sum is σ = 198149004. Its totient is φ = 132099328.

The previous prime is 165124159. The next prime is 165124187. The reversal of 165124165 is 561421561.

165124165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561421561 = 269 ⋅2087069.

It can be written as a sum of positive squares in 2 ways, for example, as 76632516 + 88491649 = 8754^2 + 9407^2 .

It is a cyclic number.

It is not a de Polignac number, because 165124165 - 2¹¹ = 165122117 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16512412 + ... + 16512421.

It is an arithmetic number, because the mean of its divisors is an integer number (49537251).

Almost surely, 2^165124165 is an apocalyptic number.

It is an amenable number.

165124165 is a deficient number, since it is larger than the sum of its proper divisors (33024839).

165124165 is an equidigital number, since it uses as much as digits as its factorization.

165124165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33024838.

The product of its digits is 7200, while the sum is 31.

The square root of 165124165 is about 12850.0647858289. The cubic root of 165124165 is about 548.6182007485.

The spelling of 165124165 in words is "one hundred sixty-five million, one hundred twenty-four thousand, one hundred sixty-five".