66668888668886 has 16 divisors (see below), whose sum is σ = 114329526834336. Its totient is φ = 28562380007616.

The previous prime is 66668888668873. The next prime is 66668888668933. The reversal of 66668888668886 is 68886688886666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66668888668792 and 66668888668801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 833362781 + ... + 833442776.

It is an arithmetic number, because the mean of its divisors is an integer number (7145595427146).

Almost surely, 2^{66668888668886} is an apocalyptic number.

66668888668886 is a deficient number, since it is larger than the sum of its proper divisors (47660638165450).

66668888668886 is a wasteful number, since it uses less digits than its factorization.

66668888668886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666808423.

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

The spelling of 66668888668886 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, six hundred sixty-eight thousand, eight hundred eighty-six".