68661816686 has 16 divisors (see below), whose sum is σ = 103161212928. Its totient is φ = 34274775000.

The previous prime is 68661816677. The next prime is 68661816697.

68661816686 is nontrivially palindromic in base 10.

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, 8032931 + ... + 8041473.

It is an arithmetic number, because the mean of its divisors is an integer number (6447575808).

Almost surely, 2^68661816686 is an apocalyptic number.

68661816686 is a deficient number, since it is larger than the sum of its proper divisors (34499396242).

68661816686 is a wasteful number, since it uses less digits than its factorization.

68661816686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14647.

The product of its digits is 23887872, while the sum is 62.

The spelling of 68661816686 in words is "sixty-eight billion, six hundred sixty-one million, eight hundred sixteen thousand, six hundred eighty-six".