5665121289 has 15 divisors (see below), whose sum is σ = 8463724093. Its totient is φ = 3776295924.

The previous prime is 5665121281. The next prime is 5665121333. The reversal of 5665121289 is 9821215665.

The square root of 5665121289 is 75267.

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

5665121289 is a `hidden beast` number, since 5 + 6 + 6 + 512 + 128 + 9 = 666.

It is not a de Polignac number, because 5665121289 - 2³ = 5665121281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5665121281) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 673222 + ... + 681584.

Almost surely, 2^5665121289 is an apocalyptic number.

5665121289 is the 75267-th square number.

5665121289 is the 37634-th centered octagonal number.

It is an amenable number.

5665121289 is a deficient number, since it is larger than the sum of its proper divisors (2798602804).

5665121289 is an frugal number, since it uses more digits than its factorization.

5665121289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16738 (or 8366 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The cubic root of 5665121289 is about 1782.6649985516.

The spelling of 5665121289 in words is "five billion, six hundred sixty-five million, one hundred twenty-one thousand, two hundred eighty-nine".