165223115 has 4 divisors (see below), whose sum is σ = 198267744. Its totient is φ = 132178488.

The previous prime is 165223103. The next prime is 165223117. The reversal of 165223115 is 511322561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511322561 = 443 ⋅1154227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165223115 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165223117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16522307 + ... + 16522316.

It is an arithmetic number, because the mean of its divisors is an integer number (49566936).

Almost surely, 2^165223115 is an apocalyptic number.

165223115 is a deficient number, since it is larger than the sum of its proper divisors (33044629).

165223115 is an equidigital number, since it uses as much as digits as its factorization.

165223115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33044628.

The product of its digits is 1800, while the sum is 26.

The square root of 165223115 is about 12853.9143843422. The cubic root of 165223115 is about 548.7277646254.

Adding to 165223115 its reverse (511322561), we get a palindrome (676545676).

The spelling of 165223115 in words is "one hundred sixty-five million, two hundred twenty-three thousand, one hundred fifteen".