668643644308 has 24 divisors (see below), whose sum is σ = 1221090696000. Its totient is φ = 319762713600.

The previous prime is 668643644293. The next prime is 668643644341. The reversal of 668643644308 is 803446346866.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 1034068 + ... + 1551316.

It is an arithmetic number, because the mean of its divisors is an integer number (50878779000).

Almost surely, 2^668643644308 is an apocalyptic number.

It is an amenable number.

668643644308 is a deficient number, since it is larger than the sum of its proper divisors (552447051692).

668643644308 is a wasteful number, since it uses less digits than its factorization.

668643644308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531327 (or 531325 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 58.

The spelling of 668643644308 in words is "six hundred sixty-eight billion, six hundred forty-three million, six hundred forty-four thousand, three hundred eight".