664641422 has 8 divisors (see below), whose sum is σ = 997450200. Its totient is φ = 332158024.

The previous prime is 664641347. The next prime is 664641433. The reversal of 664641422 is 224146466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76172 + ... + 84447.

It is an arithmetic number, because the mean of its divisors is an integer number (124681275).

Almost surely, 2^664641422 is an apocalyptic number.

664641422 is a deficient number, since it is larger than the sum of its proper divisors (332808778).

664641422 is a wasteful number, since it uses less digits than its factorization.

664641422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162690.

The product of its digits is 55296, while the sum is 35.

The square root of 664641422 is about 25780.6404497638. The cubic root of 664641422 is about 872.6949603600.

Adding to 664641422 its reverse (224146466), we get a palindrome (888787888).

The spelling of 664641422 in words is "six hundred sixty-four million, six hundred forty-one thousand, four hundred twenty-two".