68240840231 has 2 divisors, whose sum is σ = 68240840232. Its totient is φ = 68240840230.

The previous prime is 68240840189. The next prime is 68240840243. The reversal of 68240840231 is 13204804286.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68240840231 - 2³⁴ = 51060971047 is a prime.

It is a super-2 number, since 2×68240840231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68240840281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34120420115 + 34120420116.

It is an arithmetic number, because the mean of its divisors is an integer number (34120420116).

Almost surely, 2^68240840231 is an apocalyptic number.

68240840231 is a deficient number, since it is larger than the sum of its proper divisors (1).

68240840231 is an equidigital number, since it uses as much as digits as its factorization.

68240840231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 38.

The spelling of 68240840231 in words is "sixty-eight billion, two hundred forty million, eight hundred forty thousand, two hundred thirty-one".