5664565660681 has 2 divisors, whose sum is σ = 5664565660682. Its totient is φ = 5664565660680.

The previous prime is 5664565660667. The next prime is 5664565660727. The reversal of 5664565660681 is 1860665654665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3996864614656 + 1667701046025 = 1999216^2 + 1291395^2 .

It is a cyclic number.

It is not a de Polignac number, because 5664565660681 - 2¹³ = 5664565652489 is a prime.

It is a super-2 number, since 2×5664565660681² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5664565660781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832282830340 + 2832282830341.

It is an arithmetic number, because the mean of its divisors is an integer number (2832282830341).

Almost surely, 2^{5664565660681} is an apocalyptic number.

It is an amenable number.

5664565660681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5664565660681 is an equidigital number, since it uses as much as digits as its factorization.

5664565660681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624000, while the sum is 64.

The spelling of 5664565660681 in words is "five trillion, six hundred sixty-four billion, five hundred sixty-five million, six hundred sixty thousand, six hundred eighty-one".