5221231665 has 64 divisors (see below), whose sum is σ = 9192911616. Its totient is φ = 2514650112.

The previous prime is 5221231577. The next prime is 5221231669. The reversal of 5221231665 is 5661321225.

It is not a de Polignac number, because 5221231665 - 2²⁴ = 5204454449 is a prime.

It is a super-2 number, since 2×5221231665² = 54522520199197344450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5221231669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5756142 + ... + 5757048.

It is an arithmetic number, because the mean of its divisors is an integer number (143639244).

Almost surely, 2^5221231665 is an apocalyptic number.

It is an amenable number.

5221231665 is a deficient number, since it is larger than the sum of its proper divisors (3971679951).

5221231665 is a wasteful number, since it uses less digits than its factorization.

5221231665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538.

The product of its digits is 21600, while the sum is 33.

The square root of 5221231665 is about 72258.0906542651. The cubic root of 5221231665 is about 1734.8329188794.

The spelling of 5221231665 in words is "five billion, two hundred twenty-one million, two hundred thirty-one thousand, six hundred sixty-five".