68199831613 has 2 divisors, whose sum is σ = 68199831614. Its totient is φ = 68199831612.

The previous prime is 68199831611. The next prime is 68199831731. The reversal of 68199831613 is 31613899186.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62553511449 + 5646320164 = 250107^2 + 75142^2 .

It is a cyclic number.

It is not a de Polignac number, because 68199831613 - 2¹ = 68199831611 is a prime.

Together with 68199831611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68199831611) 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, 34099915806 + 34099915807.

It is an arithmetic number, because the mean of its divisors is an integer number (34099915807).

Almost surely, 2^68199831613 is an apocalyptic number.

It is an amenable number.

68199831613 is a deficient number, since it is larger than the sum of its proper divisors (1).

68199831613 is an equidigital number, since it uses as much as digits as its factorization.

68199831613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 55.

The spelling of 68199831613 in words is "sixty-eight billion, one hundred ninety-nine million, eight hundred thirty-one thousand, six hundred thirteen".