68133915856 has 20 divisors (see below), whose sum is σ = 132042190500. Its totient is φ = 34058511872.

The previous prime is 68133915821. The next prime is 68133915881. The reversal of 68133915856 is 65851933186.

68133915856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 45778881600 + 22355034256 = 213960^2 + 149516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68133915797 and 68133915806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461071 + ... + 590638.

It is an arithmetic number, because the mean of its divisors is an integer number (6602109525).

Almost surely, 2^68133915856 is an apocalyptic number.

It is an amenable number.

68133915856 is a deficient number, since it is larger than the sum of its proper divisors (63908274644).

68133915856 is a wasteful number, since it uses less digits than its factorization.

68133915856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055766 (or 1055760 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 55.

The spelling of 68133915856 in words is "sixty-eight billion, one hundred thirty-three million, nine hundred fifteen thousand, eight hundred fifty-six".