78316793809 has 2 divisors, whose sum is σ = 78316793810. Its totient is φ = 78316793808.

The previous prime is 78316793803. The next prime is 78316793879. The reversal of 78316793809 is 90839761387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40699027600 + 37617766209 = 201740^2 + 193953^2 .

It is a cyclic number.

It is not a de Polignac number, because 78316793809 - 2⁵ = 78316793777 is a prime.

It is a super-2 number, since 2×78316793809² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78316793803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39158396904 + 39158396905.

It is an arithmetic number, because the mean of its divisors is an integer number (39158396905).

Almost surely, 2^78316793809 is an apocalyptic number.

It is an amenable number.

78316793809 is a deficient number, since it is larger than the sum of its proper divisors (1).

78316793809 is an equidigital number, since it uses as much as digits as its factorization.

78316793809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 61.

The spelling of 78316793809 in words is "seventy-eight billion, three hundred sixteen million, seven hundred ninety-three thousand, eight hundred nine".