668256983268 has 192 divisors, whose sum is σ = 1926416701440. Its totient is φ = 176032217088.

The previous prime is 668256983267. The next prime is 668256983341. The reversal of 668256983268 is 862389652866.

668256983268 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (668256983267) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18992380 + ... + 19027532.

It is an arithmetic number, because the mean of its divisors is an integer number (10033420320).

Almost surely, 2^668256983268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668256983268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963208350720).

668256983268 is an abundant number, since it is smaller than the sum of its proper divisors (1258159718172).

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

668256983268 is a wasteful number, since it uses less digits than its factorization.

668256983268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35506 (or 35504 counting only the distinct ones).

The product of its digits is 358318080, while the sum is 69.

The spelling of 668256983268 in words is "six hundred sixty-eight billion, two hundred fifty-six million, nine hundred eighty-three thousand, two hundred sixty-eight".