78942165171 has 4 divisors (see below), whose sum is σ = 105256220232. Its totient is φ = 52628110112.

The previous prime is 78942165119. The next prime is 78942165187. The reversal of 78942165171 is 17156124987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17156124987 = 3 ⋅5718708329.

It is a cyclic number.

It is not a de Polignac number, because 78942165171 - 2⁹ = 78942164659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78942165271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13157027526 + ... + 13157027531.

It is an arithmetic number, because the mean of its divisors is an integer number (26314055058).

Almost surely, 2^78942165171 is an apocalyptic number.

78942165171 is a deficient number, since it is larger than the sum of its proper divisors (26314055061).

78942165171 is a wasteful number, since it uses less digits than its factorization.

78942165171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26314055060.

The product of its digits is 846720, while the sum is 51.

The spelling of 78942165171 in words is "seventy-eight billion, nine hundred forty-two million, one hundred sixty-five thousand, one hundred seventy-one".