66668888668793 has 8 divisors (see below), whose sum is σ = 66693336650496. Its totient is φ = 66644444966400.

The previous prime is 66668888668787. The next prime is 66668888668841. The reversal of 66668888668793 is 39786688886666.

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

It is a cyclic number.

It is not a de Polignac number, because 66668888668793 - 2⁴ = 66668888668777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66668888668696 and 66668888668705.

It is not an unprimeable number, because it can be changed into a prime (66668888668493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30262580 + ... + 32390762.

It is an arithmetic number, because the mean of its divisors is an integer number (8336667081312).

Almost surely, 2^{66668888668793} is an apocalyptic number.

It is an amenable number.

66668888668793 is a deficient number, since it is larger than the sum of its proper divisors (24447981703).

66668888668793 is a wasteful number, since it uses less digits than its factorization.

66668888668793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139655.

The product of its digits is 288947699712, while the sum is 95.

The spelling of 66668888668793 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, six hundred sixty-eight thousand, seven hundred ninety-three".