77798364013 has 2 divisors, whose sum is σ = 77798364014. Its totient is φ = 77798364012.

The previous prime is 77798364011. The next prime is 77798364043. The reversal of 77798364013 is 31046389777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51618476809 + 26179887204 = 227197^2 + 161802^2 .

It is a cyclic number.

It is not a de Polignac number, because 77798364013 - 2¹ = 77798364011 is a prime.

Together with 77798364011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77798364011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38899182006 + 38899182007.

It is an arithmetic number, because the mean of its divisors is an integer number (38899182007).

Almost surely, 2^77798364013 is an apocalyptic number.

It is an amenable number.

77798364013 is a deficient number, since it is larger than the sum of its proper divisors (1).

77798364013 is an equidigital number, since it uses as much as digits as its factorization.

77798364013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5334336, while the sum is 55.

The spelling of 77798364013 in words is "seventy-seven billion, seven hundred ninety-eight million, three hundred sixty-four thousand, thirteen".