68517287197 has 2 divisors, whose sum is σ = 68517287198. Its totient is φ = 68517287196.

The previous prime is 68517287191. The next prime is 68517287231. The reversal of 68517287197 is 79178271586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67797223641 + 720063556 = 260379^2 + 26834^2 .

It is a cyclic number.

It is not a de Polignac number, because 68517287197 - 2²³ = 68508898589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68517287191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34258643598 + 34258643599.

It is an arithmetic number, because the mean of its divisors is an integer number (34258643599).

Almost surely, 2^68517287197 is an apocalyptic number.

It is an amenable number.

68517287197 is a deficient number, since it is larger than the sum of its proper divisors (1).

68517287197 is an equidigital number, since it uses as much as digits as its factorization.

68517287197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11854080, while the sum is 61.

The spelling of 68517287197 in words is "sixty-eight billion, five hundred seventeen million, two hundred eighty-seven thousand, one hundred ninety-seven".