78838846165 has 4 divisors (see below), whose sum is σ = 94606615404. Its totient is φ = 63071076928.

The previous prime is 78838846159. The next prime is 78838846169. The reversal of 78838846165 is 56164883887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56164883887 = 7 ⋅8023554841.

It can be written as a sum of positive squares in 2 ways, for example, as 11150937604 + 67687908561 = 105598^2 + 260169^2 .

It is a cyclic number.

It is not a de Polignac number, because 78838846165 - 2⁹ = 78838845653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78838846097 and 78838846106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78838846169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7883884612 + ... + 7883884621.

It is an arithmetic number, because the mean of its divisors is an integer number (23651653851).

Almost surely, 2^78838846165 is an apocalyptic number.

It is an amenable number.

78838846165 is a deficient number, since it is larger than the sum of its proper divisors (15767769239).

78838846165 is a wasteful number, since it uses less digits than its factorization.

78838846165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15767769238.

The product of its digits is 61931520, while the sum is 64.

The spelling of 78838846165 in words is "seventy-eight billion, eight hundred thirty-eight million, eight hundred forty-six thousand, one hundred sixty-five".