878170844161 has 4 divisors (see below), whose sum is σ = 945722447572. Its totient is φ = 810619240752.

The previous prime is 878170844149. The next prime is 878170844179. The reversal of 878170844161 is 161448071878.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66223875600 + 811946968561 = 257340^2 + 901081^2 .

It is a cyclic number.

It is not a de Polignac number, because 878170844161 - 2²³ = 878162455553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878170844101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33775801686 + ... + 33775801711.

It is an arithmetic number, because the mean of its divisors is an integer number (236430611893).

Almost surely, 2^878170844161 is an apocalyptic number.

It is an amenable number.

878170844161 is a deficient number, since it is larger than the sum of its proper divisors (67551603411).

878170844161 is a wasteful number, since it uses less digits than its factorization.

878170844161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67551603410.

The product of its (nonzero) digits is 2408448, while the sum is 55.

The spelling of 878170844161 in words is "eight hundred seventy-eight billion, one hundred seventy million, eight hundred forty-four thousand, one hundred sixty-one".