78378616313 has 2 divisors, whose sum is σ = 78378616314. Its totient is φ = 78378616312.

The previous prime is 78378616279. The next prime is 78378616319. The reversal of 78378616313 is 31361687387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50486944249 + 27891672064 = 224693^2 + 167008^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78378616313 is a prime.

It is a super-2 number, since 2×78378616313² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78378616319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39189308156 + 39189308157.

It is an arithmetic number, because the mean of its divisors is an integer number (39189308157).

Almost surely, 2^78378616313 is an apocalyptic number.

It is an amenable number.

78378616313 is a deficient number, since it is larger than the sum of its proper divisors (1).

78378616313 is an equidigital number, since it uses as much as digits as its factorization.

78378616313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 53.

The spelling of 78378616313 in words is "seventy-eight billion, three hundred seventy-eight million, six hundred sixteen thousand, three hundred thirteen".