1223210666 has 16 divisors (see below), whose sum is σ = 1850542848. Its totient is φ = 606372000.

The previous prime is 1223210663. The next prime is 1223210689. The reversal of 1223210666 is 6660123221.

It is not an unprimeable number, because it can be changed into a prime (1223210663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509966 + ... + 512358.

It is an arithmetic number, because the mean of its divisors is an integer number (115658928).

Almost surely, 2^1223210666 is an apocalyptic number.

1223210666 is a deficient number, since it is larger than the sum of its proper divisors (627332182).

1223210666 is a wasteful number, since it uses less digits than its factorization.

1223210666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4477.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1223210666 is about 34974.4287444413. The cubic root of 1223210666 is about 1069.4662566399.

Adding to 1223210666 its reverse (6660123221), we get a palindrome (7883333887).

The spelling of 1223210666 in words is "one billion, two hundred twenty-three million, two hundred ten thousand, six hundred sixty-six".