66566305823 has 2 divisors, whose sum is σ = 66566305824. Its totient is φ = 66566305822.

The previous prime is 66566305759. The next prime is 66566305837. The reversal of 66566305823 is 32850366566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66566305823 - 2⁶ = 66566305759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66566305723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283152911 + 33283152912.

It is an arithmetic number, because the mean of its divisors is an integer number (33283152912).

Almost surely, 2^66566305823 is an apocalyptic number.

66566305823 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566305823 is an equidigital number, since it uses as much as digits as its factorization.

66566305823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 66566305823 in words is "sixty-six billion, five hundred sixty-six million, three hundred five thousand, eight hundred twenty-three".