66668888668792 has 32 divisors (see below), whose sum is σ = 126413046900000. Its totient is φ = 32958768544768.

The previous prime is 66668888668787. The next prime is 66668888668841. The reversal of 66668888668792 is 29786688886666.

It is a self number, because there is not a number n which added to its sum of digits gives 66668888668792.

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, 19339584 + ... + 22524592.

It is an arithmetic number, because the mean of its divisors is an integer number (3950407715625).

Almost surely, 2^{66668888668792} is an apocalyptic number.

It is an amenable number.

66668888668792 is a deficient number, since it is larger than the sum of its proper divisors (59744158231208).

66668888668792 is a wasteful number, since it uses less digits than its factorization.

66668888668792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214503 (or 3214499 counting only the distinct ones).

The product of its digits is 192631799808, while the sum is 94.

The spelling of 66668888668792 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, six hundred sixty-eight thousand, seven hundred ninety-two".