68705617829 has 2 divisors, whose sum is σ = 68705617830. Its totient is φ = 68705617828.

The previous prime is 68705617807. The next prime is 68705617837. The reversal of 68705617829 is 92871650786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60351292225 + 8354325604 = 245665^2 + 91402^2 .

It is a cyclic number.

It is not a de Polignac number, because 68705617829 - 2²⁰ = 68704569253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68705617129) 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, 34352808914 + 34352808915.

It is an arithmetic number, because the mean of its divisors is an integer number (34352808915).

Almost surely, 2^68705617829 is an apocalyptic number.

It is an amenable number.

68705617829 is a deficient number, since it is larger than the sum of its proper divisors (1).

68705617829 is an equidigital number, since it uses as much as digits as its factorization.

68705617829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 68705617829 in words is "sixty-eight billion, seven hundred five million, six hundred seventeen thousand, eight hundred twenty-nine".