78616694917 has 2 divisors, whose sum is σ = 78616694918. Its totient is φ = 78616694916.

The previous prime is 78616694911. The next prime is 78616694941. The reversal of 78616694917 is 71949661687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67488765796 + 11127929121 = 259786^2 + 105489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78616694917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78616694911) 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, 39308347458 + 39308347459.

It is an arithmetic number, because the mean of its divisors is an integer number (39308347459).

Almost surely, 2^78616694917 is an apocalyptic number.

It is an amenable number.

78616694917 is a deficient number, since it is larger than the sum of its proper divisors (1).

78616694917 is an equidigital number, since it uses as much as digits as its factorization.

78616694917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 64.

The spelling of 78616694917 in words is "seventy-eight billion, six hundred sixteen million, six hundred ninety-four thousand, nine hundred seventeen".