5664041720581 has 2 divisors, whose sum is σ = 5664041720582. Its totient is φ = 5664041720580.

The previous prime is 5664041720567. The next prime is 5664041720609. The reversal of 5664041720581 is 1850271404665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4867781753025 + 796259967556 = 2206305^2 + 892334^2 .

It is a cyclic number.

It is not a de Polignac number, because 5664041720581 - 2¹⁷ = 5664041589509 is a prime.

It is a super-2 number, since 2×5664041720581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5664041720881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832020860290 + 2832020860291.

It is an arithmetic number, because the mean of its divisors is an integer number (2832020860291).

Almost surely, 2^{5664041720581} is an apocalyptic number.

It is an amenable number.

5664041720581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5664041720581 is an equidigital number, since it uses as much as digits as its factorization.

5664041720581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 5664041720581 in words is "five trillion, six hundred sixty-four billion, forty-one million, seven hundred twenty thousand, five hundred eighty-one".