66186657827 has 2 divisors, whose sum is σ = 66186657828. Its totient is φ = 66186657826.

The previous prime is 66186657791. The next prime is 66186657829. The reversal of 66186657827 is 72875668166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66186657827 - 2⁶ = 66186657763 is a prime.

Together with 66186657829, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66186657827.

It is not a weakly prime, because it can be changed into another prime (66186657829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33093328913 + 33093328914.

It is an arithmetic number, because the mean of its divisors is an integer number (33093328914).

Almost surely, 2^66186657827 is an apocalyptic number.

66186657827 is a deficient number, since it is larger than the sum of its proper divisors (1).

66186657827 is an equidigital number, since it uses as much as digits as its factorization.

66186657827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 62.

The spelling of 66186657827 in words is "sixty-six billion, one hundred eighty-six million, six hundred fifty-seven thousand, eight hundred twenty-seven".