68195635217 has 2 divisors, whose sum is σ = 68195635218. Its totient is φ = 68195635216.

The previous prime is 68195635181. The next prime is 68195635243. The reversal of 68195635217 is 71253659186.

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., 67517345281 + 678289936 = 259841^2 + 26044^2 .

It is a cyclic number.

It is not a de Polignac number, because 68195635217 - 2⁶ = 68195635153 is a prime.

It is not a weakly prime, because it can be changed into another prime (68195635517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34097817608 + 34097817609.

It is an arithmetic number, because the mean of its divisors is an integer number (34097817609).

Almost surely, 2^68195635217 is an apocalyptic number.

It is an amenable number.

68195635217 is a deficient number, since it is larger than the sum of its proper divisors (1).

68195635217 is an equidigital number, since it uses as much as digits as its factorization.

68195635217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 53.

The spelling of 68195635217 in words is "sixty-eight billion, one hundred ninety-five million, six hundred thirty-five thousand, two hundred seventeen".