78616686413 has 2 divisors, whose sum is σ = 78616686414. Its totient is φ = 78616686412.

The previous prime is 78616686389. The next prime is 78616686427. The reversal of 78616686413 is 31468661687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40576864969 + 38039821444 = 201437^2 + 195038^2 .

It is an emirp because it is prime and its reverse (31468661687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78616686413 - 2²² = 78612492109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78616686443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39308343206 + 39308343207.

It is an arithmetic number, because the mean of its divisors is an integer number (39308343207).

Almost surely, 2^78616686413 is an apocalyptic number.

It is an amenable number.

78616686413 is a deficient number, since it is larger than the sum of its proper divisors (1).

78616686413 is an equidigital number, since it uses as much as digits as its factorization.

78616686413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 56.

The spelling of 78616686413 in words is "seventy-eight billion, six hundred sixteen million, six hundred eighty-six thousand, four hundred thirteen".