68721738685366 has 24 divisors (see below), whose sum is σ = 111698818218720. Its totient is φ = 31695896190816.

The previous prime is 68721738685337. The next prime is 68721738685381. The reversal of 68721738685366 is 66358683712786.

68721738685366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 68721738685292 and 68721738685301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69474046 + ... + 70456273.

It is an arithmetic number, because the mean of its divisors is an integer number (4654117425780).

Almost surely, 2^{68721738685366} is an apocalyptic number.

68721738685366 is a deficient number, since it is larger than the sum of its proper divisors (42977079533354).

68721738685366 is a wasteful number, since it uses less digits than its factorization.

68721738685366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139931800 (or 139931787 counting only the distinct ones).

The product of its digits is 2926264320, while the sum is 76.

The spelling of 68721738685366 in words is "sixty-eight trillion, seven hundred twenty-one billion, seven hundred thirty-eight million, six hundred eighty-five thousand, three hundred sixty-six".