5665492821 has 16 divisors (see below), whose sum is σ = 7827522560. Its totient is φ = 3642453360.

The previous prime is 5665492813. The next prime is 5665492841. The reversal of 5665492821 is 1282945665.

It is not a de Polignac number, because 5665492821 - 2³ = 5665492813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665492841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267775 + ... + 288156.

It is an arithmetic number, because the mean of its divisors is an integer number (489220160).

Almost surely, 2^5665492821 is an apocalyptic number.

It is an amenable number.

5665492821 is a deficient number, since it is larger than the sum of its proper divisors (2162029739).

5665492821 is a wasteful number, since it uses less digits than its factorization.

5665492821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556056.

The product of its digits is 1036800, while the sum is 48.

The square root of 5665492821 is about 75269.4680531223. The cubic root of 5665492821 is about 1782.7039681564.

The spelling of 5665492821 in words is "five billion, six hundred sixty-five million, four hundred ninety-two thousand, eight hundred twenty-one".