68656665686 has 24 divisors (see below), whose sum is σ = 118011283824. Its totient is φ = 29345793120.

The previous prime is 68656665677. The next prime is 68656665719.

68656665686 is nontrivially palindromic in base 10.

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 11 ways as a sum of consecutive naturals, for example, 20114516 + ... + 20117928.

It is an arithmetic number, because the mean of its divisors is an integer number (4917136826).

Almost surely, 2^68656665686 is an apocalyptic number.

68656665686 is a deficient number, since it is larger than the sum of its proper divisors (49354618138).

68656665686 is an frugal number, since it uses more digits than its factorization.

68656665686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7256 (or 3843 counting only the distinct ones).

The product of its digits is 447897600, while the sum is 68.

The spelling of 68656665686 in words is "sixty-eight billion, six hundred fifty-six million, six hundred sixty-five thousand, six hundred eighty-six".