68517643723 has 2 divisors, whose sum is σ = 68517643724. Its totient is φ = 68517643722.

The previous prime is 68517643703. The next prime is 68517643757. The reversal of 68517643723 is 32734671586.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68517643723 is a prime.

It is a super-2 number, since 2×68517643723² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68517643703) by changing a digit.

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 as a sum of consecutive naturals, namely, 34258821861 + 34258821862.

It is an arithmetic number, because the mean of its divisors is an integer number (34258821862).

Almost surely, 2^68517643723 is an apocalyptic number.

68517643723 is a deficient number, since it is larger than the sum of its proper divisors (1).

68517643723 is an equidigital number, since it uses as much as digits as its factorization.

68517643723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 52.

The spelling of 68517643723 in words is "sixty-eight billion, five hundred seventeen million, six hundred forty-three thousand, seven hundred twenty-three".