664940012648 has 16 divisors (see below), whose sum is σ = 1247570558880. Its totient is φ = 332254530288.

The previous prime is 664940012623. The next prime is 664940012657. The reversal of 664940012648 is 846210049466.

It is a junction number, because it is equal to n+sod(n) for n = 664940012596 and 664940012605.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 26921390 + ... + 26946077.

It is an arithmetic number, because the mean of its divisors is an integer number (77973159930).

Almost surely, 2^664940012648 is an apocalyptic number.

It is an amenable number.

664940012648 is a deficient number, since it is larger than the sum of its proper divisors (582630546232).

664940012648 is a wasteful number, since it uses less digits than its factorization.

664940012648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53869016 (or 53869012 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 664940012648 in words is "six hundred sixty-four billion, nine hundred forty million, twelve thousand, six hundred forty-eight".