222623165 has 4 divisors (see below), whose sum is σ = 267147804. Its totient is φ = 178098528.

The previous prime is 222623131. The next prime is 222623173. The reversal of 222623165 is 561326222.

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 84842521 + 137780644 = 9211^2 + 11738^2 .

It is a cyclic number.

It is not a de Polignac number, because 222623165 - 2⁶ = 222623101 is a prime.

It is a super-2 number, since 2×222623165² = 99122147189234450, which contains 22 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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22262312 + ... + 22262321.

It is an arithmetic number, because the mean of its divisors is an integer number (66786951).

Almost surely, 2^222623165 is an apocalyptic number.

It is an amenable number.

222623165 is a deficient number, since it is larger than the sum of its proper divisors (44524639).

222623165 is an equidigital number, since it uses as much as digits as its factorization.

222623165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44524638.

The product of its digits is 8640, while the sum is 29.

The square root of 222623165 is about 14920.5618191809. The cubic root of 222623165 is about 606.0709261022.

Adding to 222623165 its reverse (561326222), we get a palindrome (783949387).

The spelling of 222623165 in words is "two hundred twenty-two million, six hundred twenty-three thousand, one hundred sixty-five".