68857121909593 has 2 divisors, whose sum is σ = 68857121909594. Its totient is φ = 68857121909592.

The previous prime is 68857121909591. The next prime is 68857121909623. The reversal of 68857121909593 is 39590912175886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63289471099024 + 5567650810569 = 7955468^2 + 2359587^2 .

It is a cyclic number.

It is not a de Polignac number, because 68857121909593 - 2¹ = 68857121909591 is a prime.

Together with 68857121909591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68857121909591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34428560954796 + 34428560954797.

It is an arithmetic number, because the mean of its divisors is an integer number (34428560954797).

Almost surely, 2^{68857121909593} is an apocalyptic number.

It is an amenable number.

68857121909593 is a deficient number, since it is larger than the sum of its proper divisors (1).

68857121909593 is an equidigital number, since it uses as much as digits as its factorization.

68857121909593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 293932800, while the sum is 73.

The spelling of 68857121909593 in words is "sixty-eight trillion, eight hundred fifty-seven billion, one hundred twenty-one million, nine hundred nine thousand, five hundred ninety-three".