66176386484861 has 2 divisors, whose sum is σ = 66176386484862. Its totient is φ = 66176386484860.

The previous prime is 66176386484771. The next prime is 66176386484881. The reversal of 66176386484861 is 16848468367166.

It is a happy number.

66176386484861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64259366245636 + 1917020239225 = 8016194^2 + 1384565^2 .

It is a cyclic number.

It is not a de Polignac number, because 66176386484861 - 2²⁶ = 66176319375997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66176386484881) 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, 33088193242430 + 33088193242431.

It is an arithmetic number, because the mean of its divisors is an integer number (33088193242431).

Almost surely, 2^{66176386484861} is an apocalyptic number.

It is an amenable number.

66176386484861 is a deficient number, since it is larger than the sum of its proper divisors (1).

66176386484861 is an equidigital number, since it uses as much as digits as its factorization.

66176386484861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1337720832, while the sum is 74.

The spelling of 66176386484861 in words is "sixty-six trillion, one hundred seventy-six billion, three hundred eighty-six million, four hundred eighty-four thousand, eight hundred sixty-one".