668240655008 has 96 divisors (see below), whose sum is σ = 1397961815040. Its totient is φ = 313345105920.

The previous prime is 668240654987. The next prime is 668240655013. The reversal of 668240655008 is 800556042866.

668240655008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335292860 + ... + 335294852.

It is an arithmetic number, because the mean of its divisors is an integer number (14562102240).

Almost surely, 2^668240655008 is an apocalyptic number.

668240655008 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668240655008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698980907520).

668240655008 is an abundant number, since it is smaller than the sum of its proper divisors (729721160032).

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

668240655008 is a wasteful number, since it uses less digits than its factorization.

668240655008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910 (or 3902 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 50.

The spelling of 668240655008 in words is "six hundred sixty-eight billion, two hundred forty million, six hundred fifty-five thousand, eight".