66166611666187 has 2 divisors, whose sum is σ = 66166611666188. Its totient is φ = 66166611666186.

The previous prime is 66166611666151. The next prime is 66166611666271. The reversal of 66166611666187 is 78166611666166.

66166611666187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66166611666187 is a prime.

It is not a weakly prime, because it can be changed into another prime (66166611666107) 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, 33083305833093 + 33083305833094.

It is an arithmetic number, because the mean of its divisors is an integer number (33083305833094).

Almost surely, 2^{66166611666187} is an apocalyptic number.

66166611666187 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166611666187 is an equidigital number, since it uses as much as digits as its factorization.

66166611666187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 67.

The spelling of 66166611666187 in words is "sixty-six trillion, one hundred sixty-six billion, six hundred eleven million, six hundred sixty-six thousand, one hundred eighty-seven".