8884638065521 has 3 divisors (see below), whose sum is σ = 8884641046233. Its totient is φ = 8884635084810.

The previous prime is 8884638065449. The next prime is 8884638065549. The reversal of 8884638065521 is 1255608364888.

The square root of 8884638065521 is 2980711.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 8884638065521 - 2⁷ = 8884638065393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8884638065221) 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 2 ways as a sum of consecutive naturals, for example, 1490356 + ... + 4471066.

It is an arithmetic number, because the mean of its divisors is an integer number (2961547015411).

Almost surely, 2^{8884638065521} is an apocalyptic number.

8884638065521 is the 2980711-st square number.

8884638065521 is the 1490356-th centered octagonal number.

It is an amenable number.

8884638065521 is a deficient number, since it is larger than the sum of its proper divisors (2980712).

8884638065521 is an frugal number, since it uses more digits than its factorization.

8884638065521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5961422 (or 2980711 counting only the distinct ones).

The product of its (nonzero) digits is 88473600, while the sum is 64.

Multiplying 8884638065521 by its sum of digits (64), we get a square (568616836193344 = 23845688²).

The spelling of 8884638065521 in words is "eight trillion, eight hundred eighty-four billion, six hundred thirty-eight million, sixty-five thousand, five hundred twenty-one".