66666688888886 has 64 divisors (see below), whose sum is σ = 102072752640000. Its totient is φ = 32650422604800.

The previous prime is 66666688888873. The next prime is 66666688888901. The reversal of 66666688888886 is 68888888666666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66666688888792 and 66666688888801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14340003890 + ... + 14340008538.

It is an arithmetic number, because the mean of its divisors is an integer number (1594886760000).

Almost surely, 2^{66666688888886} is an apocalyptic number.

66666688888886 is a deficient number, since it is larger than the sum of its proper divisors (35406063751114).

66666688888886 is a wasteful number, since it uses less digits than its factorization.

66666688888886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6317.

The product of its digits is 587068342272, while the sum is 98.

The spelling of 66666688888886 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-six".