66666330593 has 2 divisors, whose sum is σ = 66666330594. Its totient is φ = 66666330592.

The previous prime is 66666330581. The next prime is 66666330629. The reversal of 66666330593 is 39503366666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66487653904 + 178676689 = 257852^2 + 13367^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666330593 - 2²⁶ = 66599221729 is a prime.

It is not a weakly prime, because it can be changed into another prime (66666336593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333165296 + 33333165297.

It is an arithmetic number, because the mean of its divisors is an integer number (33333165297).

Almost surely, 2^66666330593 is an apocalyptic number.

It is an amenable number.

66666330593 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666330593 is an equidigital number, since it uses as much as digits as its factorization.

66666330593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9447840, while the sum is 53.

The spelling of 66666330593 in words is "sixty-six billion, six hundred sixty-six million, three hundred thirty thousand, five hundred ninety-three".