668408086968 has 64 divisors (see below), whose sum is σ = 1719847883520. Its totient is φ = 216386016000.

The previous prime is 668408086963. The next prime is 668408086987. The reversal of 668408086968 is 869680804866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668408086961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2813133 + ... + 3041468.

It is an arithmetic number, because the mean of its divisors is an integer number (26872623180).

Almost surely, 2^668408086968 is an apocalyptic number.

It is an amenable number.

668408086968 is an abundant number, since it is smaller than the sum of its proper divisors (1051439796552).

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

668408086968 is a wasteful number, since it uses less digits than its factorization.

668408086968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5854748 (or 5854744 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 69.

The spelling of 668408086968 in words is "six hundred sixty-eight billion, four hundred eight million, eighty-six thousand, nine hundred sixty-eight".