666222 has 16 divisors (see below), whose sum is σ = 1368912. Its totient is φ = 216000.

The previous prime is 666203. The next prime is 666229. The reversal of 666222 is 222666.

666222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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 = 666192 and 666201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666229) 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, 1279 + ... + 1722.

It is an arithmetic number, because the mean of its divisors is an integer number (85557).

2⁶⁶⁶²²² is an apocalyptic number.

666222 is an abundant number, since it is smaller than the sum of its proper divisors (702690).

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

666222 is a wasteful number, since it uses less digits than its factorization.

666222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043.

The product of its digits is 1728, while the sum is 24.

The square root of 666222 is about 816.2242338965. The cubic root of 666222 is about 87.3386195481.

Adding to 666222 its reverse (222666), we get a palindrome (888888).

Subtracting from 666222 its reverse (222666), we obtain a square (443556 = 666²).

It can be divided in two parts, 666 and 222, that added together give a palindrome (888).

The spelling of 666222 in words is "six hundred sixty-six thousand, two hundred twenty-two".