660563041181 has 2 divisors, whose sum is σ = 660563041182. Its totient is φ = 660563041180.

The previous prime is 660563041147. The next prime is 660563041189. The reversal of 660563041181 is 181140365066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564406612900 + 96156428281 = 751270^2 + 310091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660563041181 is a prime.

It is a super-2 number, since 2×660563041181² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660563041189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330281520590 + 330281520591.

It is an arithmetic number, because the mean of its divisors is an integer number (330281520591).

Almost surely, 2^660563041181 is an apocalyptic number.

It is an amenable number.

660563041181 is a deficient number, since it is larger than the sum of its proper divisors (1).

660563041181 is an equidigital number, since it uses as much as digits as its factorization.

660563041181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 660563041181 in words is "six hundred sixty billion, five hundred sixty-three million, forty-one thousand, one hundred eighty-one".