664422666644 has 96 divisors (see below), whose sum is σ = 1382797059840. Its totient is φ = 276155264000.

The previous prime is 664422666631. The next prime is 664422666679. The reversal of 664422666644 is 446666224466.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 664422666644.

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 31 ways as a sum of consecutive naturals, for example, 2852072 + ... + 3076224.

It is an arithmetic number, because the mean of its divisors is an integer number (14404136040).

It is a self-describing number.

Almost surely, 2^664422666644 is an apocalyptic number.

It is an amenable number.

664422666644 is an abundant number, since it is smaller than the sum of its proper divisors (718374393196).

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

664422666644 is a wasteful number, since it uses less digits than its factorization.

664422666644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224321 (or 224319 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 56.

The spelling of 664422666644 in words is "six hundred sixty-four billion, four hundred twenty-two million, six hundred sixty-six thousand, six hundred forty-four".