5666544161 has 2 divisors, whose sum is σ = 5666544162. Its totient is φ = 5666544160.

The previous prime is 5666544101. The next prime is 5666544179. The reversal of 5666544161 is 1614456665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4281215761 + 1385328400 = 65431^2 + 37220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5666544161 is a prime.

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 (5666544101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2833272080 + 2833272081.

It is an arithmetic number, because the mean of its divisors is an integer number (2833272081).

Almost surely, 2^5666544161 is an apocalyptic number.

It is an amenable number.

5666544161 is a deficient number, since it is larger than the sum of its proper divisors (1).

5666544161 is an equidigital number, since it uses as much as digits as its factorization.

5666544161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 44.

The square root of 5666544161 is about 75276.4515701956. The cubic root of 5666544161 is about 1782.8142328841.

The spelling of 5666544161 in words is "five billion, six hundred sixty-six million, five hundred forty-four thousand, one hundred sixty-one".