165415 has 4 divisors (see below), whose sum is σ = 198504. Its totient is φ = 132328.

The previous prime is 165397. The next prime is 165437. The reversal of 165415 is 514561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165415 - 2⁵ = 165383 is a prime.

It is a Smith number, since the sum of its digits (22) 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, 16537 + ... + 16546.

It is an arithmetic number, because the mean of its divisors is an integer number (49626).

2¹⁶⁵⁴¹⁵ is an apocalyptic number.

165415 is a deficient number, since it is larger than the sum of its proper divisors (33089).

165415 is an equidigital number, since it uses as much as digits as its factorization.

165415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33088.

The product of its digits is 600, while the sum is 22.

The square root of 165415 is about 406.7124291192. The cubic root of 165415 is about 54.8940107578.

Adding to 165415 its reverse (514561), we get a palindrome (679976).

The spelling of 165415 in words is "one hundred sixty-five thousand, four hundred fifteen".