66664163 has 2 divisors, whose sum is σ = 66664164. Its totient is φ = 66664162.

The previous prime is 66664139. The next prime is 66664181. The reversal of 66664163 is 36146666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66664163 - 2²⁰ = 65615587 is a prime.

It is a super-2 number, since 2×66664163² = 8888221256981138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66664133) 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, 33332081 + 33332082.

It is an arithmetic number, because the mean of its divisors is an integer number (33332082).

Almost surely, 2^66664163 is an apocalyptic number.

66664163 is a deficient number, since it is larger than the sum of its proper divisors (1).

66664163 is an equidigital number, since it uses as much as digits as its factorization.

66664163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 38.

The square root of 66664163 is about 8164.8124901923. The cubic root of 66664163 is about 405.4750570392.

The spelling of 66664163 in words is "sixty-six million, six hundred sixty-four thousand, one hundred sixty-three".