78465324408817 has 2 divisors, whose sum is σ = 78465324408818. Its totient is φ = 78465324408816.

The previous prime is 78465324408781. The next prime is 78465324408827. The reversal of 78465324408817 is 71880442356487.

Together with previous prime (78465324408781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75248667810801 + 3216656598016 = 8674599^2 + 1793504^2 .

It is an emirp because it is prime and its reverse (71880442356487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78465324408817 - 2⁷ = 78465324408689 is a prime.

It is not a weakly prime, because it can be changed into another prime (78465324408827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39232662204408 + 39232662204409.

It is an arithmetic number, because the mean of its divisors is an integer number (39232662204409).

Almost surely, 2^{78465324408817} is an apocalyptic number.

It is an amenable number.

78465324408817 is a deficient number, since it is larger than the sum of its proper divisors (1).

78465324408817 is an equidigital number, since it uses as much as digits as its factorization.

78465324408817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 289013760, while the sum is 67.

The spelling of 78465324408817 in words is "seventy-eight trillion, four hundred sixty-five billion, three hundred twenty-four million, four hundred eight thousand, eight hundred seventeen".