78485792703817 has 2 divisors, whose sum is σ = 78485792703818. Its totient is φ = 78485792703816.

The previous prime is 78485792703751. The next prime is 78485792703833. The reversal of 78485792703817 is 71830729758487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55805919952896 + 22679872750921 = 7470336^2 + 4762339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78485792703817 is a prime.

It is not a weakly prime, because it can be changed into another prime (78485792709817) 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, 39242896351908 + 39242896351909.

It is an arithmetic number, because the mean of its divisors is an integer number (39242896351909).

Almost surely, 2^{78485792703817} is an apocalyptic number.

It is an amenable number.

78485792703817 is a deficient number, since it is larger than the sum of its proper divisors (1).

78485792703817 is an equidigital number, since it uses as much as digits as its factorization.

78485792703817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1327656960, while the sum is 76.

The spelling of 78485792703817 in words is "seventy-eight trillion, four hundred eighty-five billion, seven hundred ninety-two million, seven hundred three thousand, eight hundred seventeen".