165117233 has 4 divisors (see below), whose sum is σ = 166632180. Its totient is φ = 163602288.

The previous prime is 165117217. The next prime is 165117241. The reversal of 165117233 is 332711561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 118222129 + 46895104 = 10873^2 + 6848^2 .

It is a cyclic number.

It is not a de Polignac number, because 165117233 - 2⁴ = 165117217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165117196 and 165117205.

It is not an unprimeable number, because it can be changed into a prime (165117263) 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, 757310 + ... + 757527.

It is an arithmetic number, because the mean of its divisors is an integer number (41658045).

Almost surely, 2^165117233 is an apocalyptic number.

It is an amenable number.

165117233 is a deficient number, since it is larger than the sum of its proper divisors (1514947).

165117233 is a wasteful number, since it uses less digits than its factorization.

165117233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514946.

The product of its digits is 3780, while the sum is 29.

The square root of 165117233 is about 12849.7950567314. The cubic root of 165117233 is about 548.6105235467.

Adding to 165117233 its reverse (332711561), we get a palindrome (497828794).

The spelling of 165117233 in words is "one hundred sixty-five million, one hundred seventeen thousand, two hundred thirty-three".