66222222 has 16 divisors (see below), whose sum is σ = 144484992. Its totient is φ = 20067320.

The previous prime is 66222209. The next prime is 66222227. The reversal of 66222222 is 22222266.

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

66222222 is a modest number, since divided by 22222 gives 662 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66222192 and 66222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66222227) 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, 501618 + ... + 501749.

It is an arithmetic number, because the mean of its divisors is an integer number (9030312).

Almost surely, 2^66222222 is an apocalyptic number.

66222222 is an abundant number, since it is smaller than the sum of its proper divisors (78262770).

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

66222222 is a wasteful number, since it uses less digits than its factorization.

66222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003383.

The product of its digits is 2304, while the sum is 24.

The square root of 66222222 is about 8137.7037301686. The cubic root of 66222222 is about 404.5770558030.

Adding to 66222222 its reverse (22222266), we get a palindrome (88444488).

The spelling of 66222222 in words is "sixty-six million, two hundred twenty-two thousand, two hundred twenty-two".