66490437619169 has 2 divisors, whose sum is σ = 66490437619170. Its totient is φ = 66490437619168.

The previous prime is 66490437619141. The next prime is 66490437619297. The reversal of 66490437619169 is 96191673409466.

66490437619169 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 can be written as a sum of positive squares in only one way, i.e., 47888296098769 + 18602141520400 = 6920137^2 + 4313020^2 .

It is a cyclic number.

It is not a de Polignac number, because 66490437619169 - 2⁴⁰ = 65390925991393 is a prime.

It is a super-2 number, since 2×66490437619169² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66490437619129) 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, 33245218809584 + 33245218809585.

It is an arithmetic number, because the mean of its divisors is an integer number (33245218809585).

Almost surely, 2^{66490437619169} is an apocalyptic number.

It is an amenable number.

66490437619169 is a deficient number, since it is larger than the sum of its proper divisors (1).

66490437619169 is an equidigital number, since it uses as much as digits as its factorization.

66490437619169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317447424, while the sum is 71.

The spelling of 66490437619169 in words is "sixty-six trillion, four hundred ninety billion, four hundred thirty-seven million, six hundred nineteen thousand, one hundred sixty-nine".