5661140321 has 2 divisors, whose sum is σ = 5661140322. Its totient is φ = 5661140320.

The previous prime is 5661140311. The next prime is 5661140377. The reversal of 5661140321 is 1230411665.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4414273600 + 1246866721 = 66440^2 + 35311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661140321 is a prime.

It is a super-3 number, since 3×5661140321³ (a number of 30 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (5661140311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830570160 + 2830570161.

It is an arithmetic number, because the mean of its divisors is an integer number (2830570161).

Almost surely, 2^5661140321 is an apocalyptic number.

It is an amenable number.

5661140321 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661140321 is an equidigital number, since it uses as much as digits as its factorization.

5661140321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 5661140321 is about 75240.5497122396. The cubic root of 5661140321 is about 1782.2473319840.

Adding to 5661140321 its reverse (1230411665), we get a palindrome (6891551986).

The spelling of 5661140321 in words is "five billion, six hundred sixty-one million, one hundred forty thousand, three hundred twenty-one".