668888888888899 has 8 divisors (see below), whose sum is σ = 769574944072800. Its totient is φ = 569485458612096.

The previous prime is 668888888888839. The next prime is 668888888888921. The reversal of 668888888888899 is 998888888888866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668888888888899 - 2⁹ = 668888888888387 is a prime.

668888888888899 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (668888888888809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320656225654 + ... + 320656227739.

It is an arithmetic number, because the mean of its divisors is an integer number (96196868009100).

Almost surely, 2^{668888888888899} is an apocalyptic number.

668888888888899 is a deficient number, since it is larger than the sum of its proper divisors (100686055183901).

668888888888899 is a wasteful number, since it uses less digits than its factorization.

668888888888899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641312453549.

The product of its digits is 25048249270272, while the sum is 118.

The spelling of 668888888888899 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-nine".