668009954658 has 16 divisors (see below), whose sum is σ = 1341563563296. Its totient is φ = 221746042560.

The previous prime is 668009954629. The next prime is 668009954659. The reversal of 668009954658 is 856459900866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (668009954659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230984016 + ... + 230986907.

It is an arithmetic number, because the mean of its divisors is an integer number (83847722706).

Almost surely, 2^668009954658 is an apocalyptic number.

668009954658 is an abundant number, since it is smaller than the sum of its proper divisors (673553608638).

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

668009954658 is a wasteful number, since it uses less digits than its factorization.

668009954658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461971169.

The product of its (nonzero) digits is 111974400, while the sum is 66.

The spelling of 668009954658 in words is "six hundred sixty-eight billion, nine million, nine hundred fifty-four thousand, six hundred fifty-eight".