66661046611 has 2 divisors, whose sum is σ = 66661046612. Its totient is φ = 66661046610.

The previous prime is 66661046593. The next prime is 66661046653. The reversal of 66661046611 is 11664016666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66661046611 - 2¹⁵ = 66661013843 is a prime.

It is not a weakly prime, because it can be changed into another prime (66661056611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33330523305 + 33330523306.

It is an arithmetic number, because the mean of its divisors is an integer number (33330523306).

Almost surely, 2^66661046611 is an apocalyptic number.

66661046611 is a deficient number, since it is larger than the sum of its proper divisors (1).

66661046611 is an equidigital number, since it uses as much as digits as its factorization.

66661046611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 66661046611 in words is "sixty-six billion, six hundred sixty-one million, forty-six thousand, six hundred eleven".