8689351860521 has 4 divisors (see below), whose sum is σ = 8689547026692. Its totient is φ = 8689156694352.

The previous prime is 8689351860499. The next prime is 8689351860593. The reversal of 8689351860521 is 1250681539868.

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 5224675920025 + 3464675940496 = 2285755^2 + 1861364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8689351860521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8689351820521) 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, 97516286 + ... + 97605351.

It is an arithmetic number, because the mean of its divisors is an integer number (2172386756673).

Almost surely, 2^{8689351860521} is an apocalyptic number.

It is an amenable number.

8689351860521 is a deficient number, since it is larger than the sum of its proper divisors (195166171).

8689351860521 is a wasteful number, since it uses less digits than its factorization.

8689351860521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195166170.

The product of its (nonzero) digits is 24883200, while the sum is 62.

The spelling of 8689351860521 in words is "eight trillion, six hundred eighty-nine billion, three hundred fifty-one million, eight hundred sixty thousand, five hundred twenty-one".