68195635517 has 2 divisors, whose sum is σ = 68195635518. Its totient is φ = 68195635516.

The previous prime is 68195635499. The next prime is 68195635561. The reversal of 68195635517 is 71553659186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59530632121 + 8665003396 = 243989^2 + 93086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68195635517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68195635577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34097817758 + 34097817759.

It is an arithmetic number, because the mean of its divisors is an integer number (34097817759).

Almost surely, 2^68195635517 is an apocalyptic number.

It is an amenable number.

68195635517 is a deficient number, since it is larger than the sum of its proper divisors (1).

68195635517 is an equidigital number, since it uses as much as digits as its factorization.

68195635517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804000, while the sum is 56.

The spelling of 68195635517 in words is "sixty-eight billion, one hundred ninety-five million, six hundred thirty-five thousand, five hundred seventeen".