868560665309 has 4 divisors (see below), whose sum is σ = 874092899004. Its totient is φ = 863028431616.

The previous prime is 868560665249. The next prime is 868560665321. The reversal of 868560665309 is 903566065868.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 650961739684 + 217598925625 = 806822^2 + 466475^2 .

It is a cyclic number.

It is not a de Polignac number, because 868560665309 - 2²⁰ = 868559616733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868560665369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2766116612 + ... + 2766116925.

It is an arithmetic number, because the mean of its divisors is an integer number (218523224751).

Almost surely, 2^868560665309 is an apocalyptic number.

It is an amenable number.

868560665309 is a deficient number, since it is larger than the sum of its proper divisors (5532233695).

868560665309 is a wasteful number, since it uses less digits than its factorization.

868560665309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532233694.

The product of its (nonzero) digits is 55987200, while the sum is 62.

The spelling of 868560665309 in words is "eight hundred sixty-eight billion, five hundred sixty million, six hundred sixty-five thousand, three hundred nine".