66681183511 has 2 divisors, whose sum is σ = 66681183512. Its totient is φ = 66681183510.

The previous prime is 66681183467. The next prime is 66681183533. The reversal of 66681183511 is 11538118666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66681183511 - 2¹⁵ = 66681150743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66681184511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33340591755 + 33340591756.

It is an arithmetic number, because the mean of its divisors is an integer number (33340591756).

Almost surely, 2^66681183511 is an apocalyptic number.

66681183511 is a deficient number, since it is larger than the sum of its proper divisors (1).

66681183511 is an equidigital number, since it uses as much as digits as its factorization.

66681183511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The spelling of 66681183511 in words is "sixty-six billion, six hundred eighty-one million, one hundred eighty-three thousand, five hundred eleven".