68851663189 has 2 divisors, whose sum is σ = 68851663190. Its totient is φ = 68851663188.

The previous prime is 68851663187. The next prime is 68851663259. The reversal of 68851663189 is 98136615886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67279540689 + 1572122500 = 259383^2 + 39650^2 .

It is a cyclic number.

It is not a de Polignac number, because 68851663189 - 2¹ = 68851663187 is a prime.

Together with 68851663187, 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 (68851663187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34425831594 + 34425831595.

It is an arithmetic number, because the mean of its divisors is an integer number (34425831595).

Almost surely, 2^68851663189 is an apocalyptic number.

It is an amenable number.

68851663189 is a deficient number, since it is larger than the sum of its proper divisors (1).

68851663189 is an equidigital number, since it uses as much as digits as its factorization.

68851663189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14929920, while the sum is 61.

The spelling of 68851663189 in words is "sixty-eight billion, eight hundred fifty-one million, six hundred sixty-three thousand, one hundred eighty-nine".