66888888893 has 2 divisors, whose sum is σ = 66888888894. Its totient is φ = 66888888892.

The previous prime is 66888888887. The next prime is 66888888929. The reversal of 66888888893 is 39888888866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53426624164 + 13462264729 = 231142^2 + 116027^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66888888893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66888888863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33444444446 + 33444444447.

It is an arithmetic number, because the mean of its divisors is an integer number (33444444447).

Almost surely, 2^66888888893 is an apocalyptic number.

It is an amenable number.

66888888893 is a deficient number, since it is larger than the sum of its proper divisors (1).

66888888893 is an equidigital number, since it uses as much as digits as its factorization.

66888888893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2038431744, while the sum is 80.

The spelling of 66888888893 in words is "sixty-six billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-three".