222216666 has 64 divisors (see below), whose sum is σ = 545664000. Its totient is φ = 60138288.

The previous prime is 222216661. The next prime is 222216671. The reversal of 222216666 is 666612222.

It is an interprime number because it is at equal distance from previous prime (222216661) and next prime (222216671).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (222216661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36261 + ... + 41943.

It is an arithmetic number, because the mean of its divisors is an integer number (8526000).

Almost surely, 2^222216666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222216666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272832000).

222216666 is an abundant number, since it is smaller than the sum of its proper divisors (323447334).

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

222216666 is a wasteful number, since it uses less digits than its factorization.

222216666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728 (or 5714 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 222216666 is about 14906.9334874749. The cubic root of 222216666 is about 605.7018160724.

Adding to 222216666 its reverse (666612222), we get a palindrome (888828888).

The spelling of 222216666 in words is "two hundred twenty-two million, two hundred sixteen thousand, six hundred sixty-six".