68072000681 has 2 divisors, whose sum is σ = 68072000682. Its totient is φ = 68072000680.

The previous prime is 68072000639. The next prime is 68072000693. The reversal of 68072000681 is 18600027086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65938022656 + 2133978025 = 256784^2 + 46195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68072000681 is a prime.

It is a super-2 number, since 2×68072000681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68072002681) by changing a digit.

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 as a sum of consecutive naturals, namely, 34036000340 + 34036000341.

It is an arithmetic number, because the mean of its divisors is an integer number (34036000341).

Almost surely, 2^68072000681 is an apocalyptic number.

It is an amenable number.

68072000681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68072000681 is an equidigital number, since it uses as much as digits as its factorization.

68072000681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 68072000681 in words is "sixty-eight billion, seventy-two million, six hundred eighty-one", and thus it is an aban number.