222222666 has 16 divisors (see below), whose sum is σ = 456457824. Its totient is φ = 72072144.

The previous prime is 222222659. The next prime is 222222683. The reversal of 222222666 is 666222222.

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500280 + ... + 500723.

It is an arithmetic number, because the mean of its divisors is an integer number (28528614).

Almost surely, 2^222222666 is an apocalyptic number.

222222666 is an abundant number, since it is smaller than the sum of its proper divisors (234235158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222222666 is a wasteful number, since it uses less digits than its factorization.

222222666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001045.

The product of its digits is 13824, while the sum is 30.

The square root of 222222666 is about 14907.1347347503. The cubic root of 222222666 is about 605.7072674760.

Adding to 222222666 its reverse (666222222), we get a palindrome (888444888).

The spelling of 222222666 in words is "two hundred twenty-two million, two hundred twenty-two thousand, six hundred sixty-six".