664610222 has 4 divisors (see below), whose sum is σ = 996915336. Its totient is φ = 332305110.

The previous prime is 664610213. The next prime is 664610227. The reversal of 664610222 is 222016466.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664610227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166152554 + ... + 166152557.

It is an arithmetic number, because the mean of its divisors is an integer number (249228834).

Almost surely, 2^664610222 is an apocalyptic number.

664610222 is a deficient number, since it is larger than the sum of its proper divisors (332305114).

664610222 is a wasteful number, since it uses less digits than its factorization.

664610222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332305113.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 664610222 is about 25780.0353374467. The cubic root of 664610222 is about 872.6813046212.

Adding to 664610222 its reverse (222016466), we get a palindrome (886626688).

The spelling of 664610222 in words is "six hundred sixty-four million, six hundred ten thousand, two hundred twenty-two".