9889861384225 has 81 divisors (see below), whose sum is σ = 12814125156651. Its totient is φ = 7571708179200.

The previous prime is 9889861384181. The next prime is 9889861384241. The reversal of 9889861384225 is 5224831689889.

The square root of 9889861384225 is 3144815.

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

9889861384225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 13 ways, for example, as 5128807207969 + 4761054176256 = 2264687^2 + 2181984^2 .

It is not a de Polignac number, because 9889861384225 - 2⁷ = 9889861384097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 51779378880 + ... + 51779379070.

Almost surely, 2^{9889861384225} is an apocalyptic number.

9889861384225 is the 3144815-th square number.

9889861384225 is the 1572408-th centered octagonal number.

It is an amenable number.

9889861384225 is a deficient number, since it is larger than the sum of its proper divisors (2924263772426).

9889861384225 is an frugal number, since it uses more digits than its factorization.

9889861384225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 322 counting only the distinct ones).

The product of its digits is 477757440, while the sum is 73.

The spelling of 9889861384225 in words is "nine trillion, eight hundred eighty-nine billion, eight hundred sixty-one million, three hundred eighty-four thousand, two hundred twenty-five".