68517287231 has 2 divisors, whose sum is σ = 68517287232. Its totient is φ = 68517287230.

The previous prime is 68517287197. The next prime is 68517287287. The reversal of 68517287231 is 13278271586.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68517287231 is a prime.

It is a super-2 number, since 2×68517287231² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68517287231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68517287131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34258643615 + 34258643616.

It is an arithmetic number, because the mean of its divisors is an integer number (34258643616).

Almost surely, 2^68517287231 is an apocalyptic number.

68517287231 is a deficient number, since it is larger than the sum of its proper divisors (1).

68517287231 is an equidigital number, since it uses as much as digits as its factorization.

68517287231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 50.

The spelling of 68517287231 in words is "sixty-eight billion, five hundred seventeen million, two hundred eighty-seven thousand, two hundred thirty-one".