78217560368617 has 2 divisors, whose sum is σ = 78217560368618. Its totient is φ = 78217560368616.

The previous prime is 78217560368543. The next prime is 78217560368663. The reversal of 78217560368617 is 71686306571287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78136212201961 + 81348166656 = 8839469^2 + 285216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78217560368617 is a prime.

It is a super-3 number, since 3×78217560368617³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (78217560368917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39108780184308 + 39108780184309.

It is an arithmetic number, because the mean of its divisors is an integer number (39108780184309).

Almost surely, 2^{78217560368617} is an apocalyptic number.

It is an amenable number.

78217560368617 is a deficient number, since it is larger than the sum of its proper divisors (1).

78217560368617 is an equidigital number, since it uses as much as digits as its factorization.

78217560368617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142248960, while the sum is 67.

The spelling of 78217560368617 in words is "seventy-eight trillion, two hundred seventeen billion, five hundred sixty million, three hundred sixty-eight thousand, six hundred seventeen".