66744259811 has 2 divisors, whose sum is σ = 66744259812. Its totient is φ = 66744259810.

The previous prime is 66744259789. The next prime is 66744259849. The reversal of 66744259811 is 11895244766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66744259811 - 2¹⁰ = 66744258787 is a prime.

It is not a weakly prime, because it can be changed into another prime (66744259891) 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, 33372129905 + 33372129906.

It is an arithmetic number, because the mean of its divisors is an integer number (33372129906).

Almost surely, 2^66744259811 is an apocalyptic number.

66744259811 is a deficient number, since it is larger than the sum of its proper divisors (1).

66744259811 is an equidigital number, since it uses as much as digits as its factorization.

66744259811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 53.

The spelling of 66744259811 in words is "sixty-six billion, seven hundred forty-four million, two hundred fifty-nine thousand, eight hundred eleven".