66668888668887 has 12 divisors (see below), whose sum is σ = 97618677169104. Its totient is φ = 43837077480480.

The previous prime is 66668888668873. The next prime is 66668888668933. The reversal of 66668888668887 is 78886688886666.

It is not a de Polignac number, because 66668888668887 - 2⁸ = 66668888668631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668888668387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50737357539 + ... + 50737358852.

It is an arithmetic number, because the mean of its divisors is an integer number (8134889764092).

Almost surely, 2^{66668888668887} is an apocalyptic number.

66668888668887 is a deficient number, since it is larger than the sum of its proper divisors (30949788500217).

66668888668887 is a wasteful number, since it uses less digits than its factorization.

66668888668887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101474716470 (or 101474716467 counting only the distinct ones).

The product of its digits is 684913065984, while the sum is 99.

The spelling of 66668888668887 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, six hundred sixty-eight thousand, eight hundred eighty-seven".