668518640308 has 24 divisors (see below), whose sum is σ = 1201287447360. Its totient is φ = 325403664000.

The previous prime is 668518640219. The next prime is 668518640311. The reversal of 668518640308 is 803046815866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13726693 + ... + 13775308.

It is an arithmetic number, because the mean of its divisors is an integer number (50053643640).

Almost surely, 2^668518640308 is an apocalyptic number.

It is an amenable number.

668518640308 is a deficient number, since it is larger than the sum of its proper divisors (532768807052).

668518640308 is a wasteful number, since it uses less digits than its factorization.

668518640308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27502167 (or 27502165 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 55.

The spelling of 668518640308 in words is "six hundred sixty-eight billion, five hundred eighteen million, six hundred forty thousand, three hundred eight".