78876143484209 has 2 divisors, whose sum is σ = 78876143484210. Its totient is φ = 78876143484208.

The previous prime is 78876143484143. The next prime is 78876143484223. The reversal of 78876143484209 is 90248434167887.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50806915642609 + 28069227841600 = 7127897^2 + 5298040^2 .

It is an emirp because it is prime and its reverse (90248434167887) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78876143484209 is a prime.

It is not a weakly prime, because it can be changed into another prime (78876143484289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39438071742104 + 39438071742105.

It is an arithmetic number, because the mean of its divisors is an integer number (39438071742105).

Almost surely, 2^{78876143484209} is an apocalyptic number.

It is an amenable number.

78876143484209 is a deficient number, since it is larger than the sum of its proper divisors (1).

78876143484209 is an equidigital number, since it uses as much as digits as its factorization.

78876143484209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 520224768, while the sum is 71.

The spelling of 78876143484209 in words is "seventy-eight trillion, eight hundred seventy-six billion, one hundred forty-three million, four hundred eighty-four thousand, two hundred nine".