5661056321 has 4 divisors (see below), whose sum is σ = 5994059652. Its totient is φ = 5328052992.

The previous prime is 5661056267. The next prime is 5661056333. The reversal of 5661056321 is 1236501665.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4358640400 + 1302415921 = 66020^2 + 36089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661056321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5661056381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166501640 + ... + 166501673.

It is an arithmetic number, because the mean of its divisors is an integer number (1498514913).

Almost surely, 2^5661056321 is an apocalyptic number.

It is an amenable number.

5661056321 is a deficient number, since it is larger than the sum of its proper divisors (333003331).

5661056321 is a wasteful number, since it uses less digits than its factorization.

5661056321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333003330.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 5661056321 is about 75239.9915005312. The cubic root of 5661056321 is about 1782.2385169451.

Adding to 5661056321 its reverse (1236501665), we get a palindrome (6897557986).

The spelling of 5661056321 in words is "five billion, six hundred sixty-one million, fifty-six thousand, three hundred twenty-one".