78515935513 has 2 divisors, whose sum is σ = 78515935514. Its totient is φ = 78515935512.

The previous prime is 78515935501. The next prime is 78515935549. The reversal of 78515935513 is 31553951587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46185018649 + 32330916864 = 214907^2 + 179808^2 .

It is a cyclic number.

It is not a de Polignac number, because 78515935513 - 2⁵ = 78515935481 is a prime.

It is not a weakly prime, because it can be changed into another prime (78515935213) 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 as a sum of consecutive naturals, namely, 39257967756 + 39257967757.

It is an arithmetic number, because the mean of its divisors is an integer number (39257967757).

Almost surely, 2^78515935513 is an apocalyptic number.

It is an amenable number.

78515935513 is a deficient number, since it is larger than the sum of its proper divisors (1).

78515935513 is an equidigital number, since it uses as much as digits as its factorization.

78515935513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835000, while the sum is 52.

The spelling of 78515935513 in words is "seventy-eight billion, five hundred fifteen million, nine hundred thirty-five thousand, five hundred thirteen".