668617802384 has 20 divisors (see below), whose sum is σ = 1480510848384. Its totient is φ = 286550486688.

The previous prime is 668617802351. The next prime is 668617802389. The reversal of 668617802384 is 483208716866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (668617802389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2984900792 + ... + 2984901015.

Almost surely, 2^668617802384 is an apocalyptic number.

It is an amenable number.

668617802384 is an abundant number, since it is smaller than the sum of its proper divisors (811893046000).

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

668617802384 is a wasteful number, since it uses less digits than its factorization.

668617802384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5969801822 (or 5969801816 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 59.

The spelling of 668617802384 in words is "six hundred sixty-eight billion, six hundred seventeen million, eight hundred two thousand, three hundred eighty-four".