2189865616 has 15 divisors (see below), whose sum is σ = 4243227331. Its totient is φ = 1094839216.

The previous prime is 2189865599. The next prime is 2189865619. The reversal of 2189865616 is 6165689812.

The square root of 2189865616 is 46796.

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

It is a super-2 number, since 2×2189865616² = 9591022832278118912, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189865619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 181335 + ... + 193033.

Almost surely, 2^2189865616 is an apocalyptic number.

2189865616 is the 46796-th square number.

It is an amenable number.

2189865616 is a deficient number, since it is larger than the sum of its proper divisors (2053361715).

2189865616 is an frugal number, since it uses more digits than its factorization.

2189865616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23406 (or 11701 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 52.

The cubic root of 2189865616 is about 1298.5912977261.

The spelling of 2189865616 in words is "two billion, one hundred eighty-nine million, eight hundred sixty-five thousand, six hundred sixteen".