222145665 has 32 divisors (see below), whose sum is σ = 414508800. Its totient is φ = 101549952.

The previous prime is 222145639. The next prime is 222145711. The reversal of 222145665 is 566541222.

222145665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222145665 - 2⁹ = 222145153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16444 + ... + 26733.

It is an arithmetic number, because the mean of its divisors is an integer number (12953400).

Almost surely, 2^222145665 is an apocalyptic number.

It is an amenable number.

222145665 is a deficient number, since it is larger than the sum of its proper divisors (192363135).

222145665 is an equidigital number, since it uses as much as digits as its factorization.

222145665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43206 (or 43192 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 222145665 is about 14904.5518215074. The cubic root of 222145665 is about 605.6372994357.

Adding to 222145665 its reverse (566541222), we get a palindrome (788686887).

The spelling of 222145665 in words is "two hundred twenty-two million, one hundred forty-five thousand, six hundred sixty-five".