668888888888898 has 48 divisors (see below), whose sum is σ = 1457521532039040. Its totient is φ = 221695247344032.

The previous prime is 668888888888839. The next prime is 668888888888921. The reversal of 668888888888898 is 898888888888866.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 139444033 + ... + 144161076.

It is an arithmetic number, because the mean of its divisors is an integer number (30365031917480).

Almost surely, 2^{668888888888898} is an apocalyptic number.

668888888888898 is an abundant number, since it is smaller than the sum of its proper divisors (788632643150142).

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

668888888888898 is a wasteful number, since it uses less digits than its factorization.

668888888888898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283605863 (or 283605860 counting only the distinct ones).

The product of its digits is 22265110462464, while the sum is 117.

The spelling of 668888888888898 in words is "six hundred sixty-eight trillion, eight hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-eight".