223216165 has 4 divisors (see below), whose sum is σ = 267859404. Its totient is φ = 178572928.

The previous prime is 223216121. The next prime is 223216187. The reversal of 223216165 is 561612322.

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 132319009 + 90897156 = 11503^2 + 9534^2 .

It is a cyclic number.

It is not a de Polignac number, because 223216165 - 2¹³ = 223207973 is a prime.

It is a super-3 number, since 3×223216165³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22321612 + ... + 22321621.

It is an arithmetic number, because the mean of its divisors is an integer number (66964851).

Almost surely, 2^223216165 is an apocalyptic number.

It is an amenable number.

223216165 is a deficient number, since it is larger than the sum of its proper divisors (44643239).

223216165 is an equidigital number, since it uses as much as digits as its factorization.

223216165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44643238.

The product of its digits is 4320, while the sum is 28.

The square root of 223216165 is about 14940.4205094770. The cubic root of 223216165 is about 606.6085781774.

Adding to 223216165 its reverse (561612322), we get a palindrome (784828487).

The spelling of 223216165 in words is "two hundred twenty-three million, two hundred sixteen thousand, one hundred sixty-five".