66684593 has 2 divisors, whose sum is σ = 66684594. Its totient is φ = 66684592.

The previous prime is 66684581. The next prime is 66684643. The reversal of 66684593 is 39548666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43191184 + 23493409 = 6572^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 66684593 - 2¹⁰ = 66683569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66684533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33342296 + 33342297.

It is an arithmetic number, because the mean of its divisors is an integer number (33342297).

Almost surely, 2^66684593 is an apocalyptic number.

It is an amenable number.

66684593 is a deficient number, since it is larger than the sum of its proper divisors (1).

66684593 is an equidigital number, since it uses as much as digits as its factorization.

66684593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 47.

The square root of 66684593 is about 8166.0634947323. The cubic root of 66684593 is about 405.5164736413.

The spelling of 66684593 in words is "sixty-six million, six hundred eighty-four thousand, five hundred ninety-three".