868560665249 has 2 divisors, whose sum is σ = 868560665250. Its totient is φ = 868560665248.

The previous prime is 868560665207. The next prime is 868560665321. The reversal of 868560665249 is 942566065868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515605855249 + 352954810000 = 718057^2 + 594100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868560665249 is a prime.

It is not a weakly prime, because it can be changed into another prime (868560661249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434280332624 + 434280332625.

It is an arithmetic number, because the mean of its divisors is an integer number (434280332625).

Almost surely, 2^868560665249 is an apocalyptic number.

It is an amenable number.

868560665249 is a deficient number, since it is larger than the sum of its proper divisors (1).

868560665249 is an equidigital number, since it uses as much as digits as its factorization.

868560665249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 149299200, while the sum is 65.

The spelling of 868560665249 in words is "eight hundred sixty-eight billion, five hundred sixty million, six hundred sixty-five thousand, two hundred forty-nine".