78319767811 has 2 divisors, whose sum is σ = 78319767812. Its totient is φ = 78319767810.

The previous prime is 78319767787. The next prime is 78319767847. The reversal of 78319767811 is 11876791387.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78319767811 is a prime.

It is a super-2 number, since 2×78319767811² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78319762811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39159883905 + 39159883906.

It is an arithmetic number, because the mean of its divisors is an integer number (39159883906).

Almost surely, 2^78319767811 is an apocalyptic number.

78319767811 is a deficient number, since it is larger than the sum of its proper divisors (1).

78319767811 is an equidigital number, since it uses as much as digits as its factorization.

78319767811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 58.

The spelling of 78319767811 in words is "seventy-eight billion, three hundred nineteen million, seven hundred sixty-seven thousand, eight hundred eleven".