78594775852171 has 4 divisors (see below), whose sum is σ = 79213632355072. Its totient is φ = 77975919349272.

The previous prime is 78594775852111. The next prime is 78594775852181. The reversal of 78594775852171 is 17125857749587.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78594775852171 - 2⁹ = 78594775851659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78594775852111) 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 in 3 ways as a sum of consecutive naturals, for example, 309428251260 + ... + 309428251513.

It is an arithmetic number, because the mean of its divisors is an integer number (19803408088768).

Almost surely, 2^{78594775852171} is an apocalyptic number.

78594775852171 is a deficient number, since it is larger than the sum of its proper divisors (618856502901).

78594775852171 is a wasteful number, since it uses less digits than its factorization.

78594775852171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618856502900.

The product of its digits is 1382976000, while the sum is 76.

The spelling of 78594775852171 in words is "seventy-eight trillion, five hundred ninety-four billion, seven hundred seventy-five million, eight hundred fifty-two thousand, one hundred seventy-one".