165512217 has 8 divisors (see below), whose sum is σ = 237658624. Its totient is φ = 101853648.

The previous prime is 165512183. The next prime is 165512231. The reversal of 165512217 is 712215561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165512217 - 2⁷ = 165512089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165512257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2121913 + ... + 2121990.

It is an arithmetic number, because the mean of its divisors is an integer number (29707328).

Almost surely, 2^165512217 is an apocalyptic number.

It is an amenable number.

165512217 is a deficient number, since it is larger than the sum of its proper divisors (72146407).

165512217 is a wasteful number, since it uses less digits than its factorization.

165512217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4243919.

The product of its digits is 4200, while the sum is 30.

The square root of 165512217 is about 12865.1551486953. The cubic root of 165512217 is about 549.0476267652.

Adding to 165512217 its reverse (712215561), we get a palindrome (877727778).

The spelling of 165512217 in words is "one hundred sixty-five million, five hundred twelve thousand, two hundred seventeen".