8817678561 has 16 divisors (see below), whose sum is σ = 11994448320. Its totient is φ = 5760318720.

The previous prime is 8817678557. The next prime is 8817678563. The reversal of 8817678561 is 1658767188.

It is not a de Polignac number, because 8817678561 - 2² = 8817678557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8817678563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24180 + ... + 134981.

It is an arithmetic number, because the mean of its divisors is an integer number (749653020).

Almost surely, 2^8817678561 is an apocalyptic number.

It is an amenable number.

8817678561 is a deficient number, since it is larger than the sum of its proper divisors (3176769759).

8817678561 is a wasteful number, since it uses less digits than its factorization.

8817678561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159536.

The product of its digits is 4515840, while the sum is 57.

The square root of 8817678561 is about 93902.4949668538. The cubic root of 8817678561 is about 2065.9418233486.

It can be divided in two parts, 8817 and 678561, that added together give a triangular number (687378 = T₁₁₇₂).

The spelling of 8817678561 in words is "eight billion, eight hundred seventeen million, six hundred seventy-eight thousand, five hundred sixty-one".