222665 has 4 divisors (see below), whose sum is σ = 267204. Its totient is φ = 178128.

The previous prime is 222659. The next prime is 222679. The reversal of 222665 is 566222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566222 = 2 ⋅283111.

It can be written as a sum of positive squares in 2 ways, for example, as 104329 + 118336 = 323^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 222665 - 2⁶ = 222601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22262 + ... + 22271.

It is an arithmetic number, because the mean of its divisors is an integer number (66801).

2²²²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

222665 is a deficient number, since it is larger than the sum of its proper divisors (44539).

222665 is an equidigital number, since it uses as much as digits as its factorization.

222665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44538.

The product of its digits is 1440, while the sum is 23.

The square root of 222665 is about 471.8739238398. The cubic root of 222665 is about 60.6108887694.

Adding to 222665 its reverse (566222), we get a palindrome (788887).

The spelling of 222665 in words is "two hundred twenty-two thousand, six hundred sixty-five".