865421968713 has 4 divisors (see below), whose sum is σ = 1153895958288. Its totient is φ = 576947979140.

The previous prime is 865421968687. The next prime is 865421968717. The reversal of 865421968713 is 317869124568.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 865421968713 - 2⁸ = 865421968457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865421968717) 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, 144236994783 + ... + 144236994788.

It is an arithmetic number, because the mean of its divisors is an integer number (288473989572).

Almost surely, 2^865421968713 is an apocalyptic number.

It is an amenable number.

865421968713 is a deficient number, since it is larger than the sum of its proper divisors (288473989575).

865421968713 is a wasteful number, since it uses less digits than its factorization.

865421968713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288473989574.

The product of its digits is 17418240, while the sum is 60.

The spelling of 865421968713 in words is "eight hundred sixty-five billion, four hundred twenty-one million, nine hundred sixty-eight thousand, seven hundred thirteen".