66660010019 has 2 divisors, whose sum is σ = 66660010020. Its totient is φ = 66660010018.

The previous prime is 66660009991. The next prime is 66660010049. The reversal of 66660010019 is 91001006666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66660010019 - 2⁸ = 66660009763 is a prime.

It is a super-2 number, since 2×66660010019² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66660010049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33330005009 + 33330005010.

It is an arithmetic number, because the mean of its divisors is an integer number (33330005010).

Almost surely, 2^66660010019 is an apocalyptic number.

66660010019 is a deficient number, since it is larger than the sum of its proper divisors (1).

66660010019 is an equidigital number, since it uses as much as digits as its factorization.

66660010019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 66660010019 in words is "sixty-six billion, six hundred sixty million, ten thousand, nineteen".