868778711617 has 2 divisors, whose sum is σ = 868778711618. Its totient is φ = 868778711616.

The previous prime is 868778711587. The next prime is 868778711629. The reversal of 868778711617 is 716117877868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624504545536 + 244274166081 = 790256^2 + 494241^2 .

It is a cyclic number.

It is not a de Polignac number, because 868778711617 - 2¹⁵ = 868778678849 is a prime.

It is not a weakly prime, because it can be changed into another prime (868778711687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434389355808 + 434389355809.

It is an arithmetic number, because the mean of its divisors is an integer number (434389355809).

Almost surely, 2^868778711617 is an apocalyptic number.

It is an amenable number.

868778711617 is a deficient number, since it is larger than the sum of its proper divisors (1).

868778711617 is an equidigital number, since it uses as much as digits as its factorization.

868778711617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44255232, while the sum is 67.

The spelling of 868778711617 in words is "eight hundred sixty-eight billion, seven hundred seventy-eight million, seven hundred eleven thousand, six hundred seventeen".