66668888889998 has 8 divisors (see below), whose sum is σ = 100017186152520. Its totient is φ = 33329826839160.

The previous prime is 66668888889991. The next prime is 66668888890001. The reversal of 66668888889998 is 89998888886666.

66668888889998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 66668888889895 and 66668888889904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668888889991) 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 3 ways as a sum of consecutive naturals, for example, 2308784873 + ... + 2308813748.

It is an arithmetic number, because the mean of its divisors is an integer number (12502148269065).

Almost surely, 2^{66668888889998} is an apocalyptic number.

66668888889998 is a deficient number, since it is larger than the sum of its proper divisors (33348297262522).

66668888889998 is a wasteful number, since it uses less digits than its factorization.

66668888889998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4617605842.

The product of its digits is 1981355655168, while the sum is 107.

The spelling of 66668888889998 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, eight hundred eighty-nine thousand, nine hundred ninety-eight".