66688822778843 has 2 divisors, whose sum is σ = 66688822778844. Its totient is φ = 66688822778842.

The previous prime is 66688822778833. The next prime is 66688822778947. The reversal of 66688822778843 is 34887722888666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66688822778843 - 2⁴ = 66688822778827 is a prime.

It is not a weakly prime, because it can be changed into another prime (66688822778833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33344411389421 + 33344411389422.

It is an arithmetic number, because the mean of its divisors is an integer number (33344411389422).

Almost surely, 2^{66688822778843} is an apocalyptic number.

66688822778843 is a deficient number, since it is larger than the sum of its proper divisors (1).

66688822778843 is an equidigital number, since it uses as much as digits as its factorization.

66688822778843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16647192576, while the sum is 83.

The spelling of 66688822778843 in words is "sixty-six trillion, six hundred eighty-eight billion, eight hundred twenty-two million, seven hundred seventy-eight thousand, eight hundred forty-three".