6666636454393 has 2 divisors, whose sum is σ = 6666636454394. Its totient is φ = 6666636454392.

The previous prime is 6666636454369. The next prime is 6666636454477. The reversal of 6666636454393 is 3934546366666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4138832185744 + 2527804268649 = 2034412^2 + 1589907^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666636454393 - 2²¹ = 6666634357241 is a prime.

It is not a weakly prime, because it can be changed into another prime (6666636454193) 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, 3333318227196 + 3333318227197.

It is an arithmetic number, because the mean of its divisors is an integer number (3333318227197).

Almost surely, 2^{6666636454393} is an apocalyptic number.

It is an amenable number.

6666636454393 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666636454393 is an equidigital number, since it uses as much as digits as its factorization.

6666636454393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 906992640, while the sum is 67.

The spelling of 6666636454393 in words is "six trillion, six hundred sixty-six billion, six hundred thirty-six million, four hundred fifty-four thousand, three hundred ninety-three".