78616686361 has 2 divisors, whose sum is σ = 78616686362. Its totient is φ = 78616686360.

The previous prime is 78616686347. The next prime is 78616686389. The reversal of 78616686361 is 16368661687.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68039592336 + 10577094025 = 260844^2 + 102845^2 .

It is a cyclic number.

It is not a de Polignac number, because 78616686361 - 2¹⁹ = 78616162073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78616686296 and 78616686305.

It is not a weakly prime, because it can be changed into another prime (78616686301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39308343180 + 39308343181.

It is an arithmetic number, because the mean of its divisors is an integer number (39308343181).

Almost surely, 2^78616686361 is an apocalyptic number.

It is an amenable number.

78616686361 is a deficient number, since it is larger than the sum of its proper divisors (1).

78616686361 is an equidigital number, since it uses as much as digits as its factorization.

78616686361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 58.

The spelling of 78616686361 in words is "seventy-eight billion, six hundred sixteen million, six hundred eighty-six thousand, three hundred sixty-one".