664222222 has 16 divisors (see below), whose sum is σ = 1022791392. Its totient is φ = 323326080.

The previous prime is 664222217. The next prime is 664222241. The reversal of 664222222 is 222222466.

664222222 is a modest number, since divided by 22222 gives 6642 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

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, 31618 + ... + 48250.

It is an arithmetic number, because the mean of its divisors is an integer number (63924462).

Almost surely, 2^664222222 is an apocalyptic number.

664222222 is a deficient number, since it is larger than the sum of its proper divisors (358569170).

664222222 is a wasteful number, since it uses less digits than its factorization.

664222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17163.

The product of its digits is 9216, while the sum is 28.

The square root of 664222222 is about 25772.5090357924. The cubic root of 664222222 is about 872.5114475391.

Adding to 664222222 its reverse (222222466), we get a palindrome (886444688).

It can be divided in two parts, 66422 and 2222, that added together give a square (68644 = 262²).

The spelling of 664222222 in words is "six hundred sixty-four million, two hundred twenty-two thousand, two hundred twenty-two".