78319767847 has 2 divisors, whose sum is σ = 78319767848. Its totient is φ = 78319767846.

The previous prime is 78319767811. The next prime is 78319767899. The reversal of 78319767847 is 74876791387.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78319767847 is a prime.

It is a super-2 number, since 2×78319767847² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78319767347) 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, 39159883923 + 39159883924.

It is an arithmetic number, because the mean of its divisors is an integer number (39159883924).

Almost surely, 2^78319767847 is an apocalyptic number.

78319767847 is a deficient number, since it is larger than the sum of its proper divisors (1).

78319767847 is an equidigital number, since it uses as much as digits as its factorization.

78319767847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 99574272, while the sum is 67.

The spelling of 78319767847 in words is "seventy-eight billion, three hundred nineteen million, seven hundred sixty-seven thousand, eight hundred forty-seven".