65968709813 has 4 divisors (see below), whose sum is σ = 68243492940. Its totient is φ = 63693926688.

The previous prime is 65968709791. The next prime is 65968709819. The reversal of 65968709813 is 31890786956.

It is a happy number.

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 20346740164 + 45621969649 = 142642^2 + 213593^2 .

It is a cyclic number.

It is not a de Polignac number, because 65968709813 - 2¹⁰ = 65968708789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65968709819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1137391520 + ... + 1137391577.

It is an arithmetic number, because the mean of its divisors is an integer number (17060873235).

Almost surely, 2^65968709813 is an apocalyptic number.

It is an amenable number.

65968709813 is a deficient number, since it is larger than the sum of its proper divisors (2274783127).

65968709813 is a wasteful number, since it uses less digits than its factorization.

65968709813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274783126.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 65968709813 in words is "sixty-five billion, nine hundred sixty-eight million, seven hundred nine thousand, eight hundred thirteen".