668835081228 has 12 divisors (see below), whose sum is σ = 1560615189560. Its totient is φ = 222945027072.

The previous prime is 668835081223. The next prime is 668835081247. The reversal of 668835081228 is 822180538866.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (668835081223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27868128373 + ... + 27868128396.

Almost surely, 2^668835081228 is an apocalyptic number.

It is an amenable number.

668835081228 is an abundant number, since it is smaller than the sum of its proper divisors (891780108332).

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

668835081228 is a wasteful number, since it uses less digits than its factorization.

668835081228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55736256776 (or 55736256774 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 57.

The spelling of 668835081228 in words is "six hundred sixty-eight billion, eight hundred thirty-five million, eighty-one thousand, two hundred twenty-eight".