66393828889 has 2 divisors, whose sum is σ = 66393828890. Its totient is φ = 66393828888.

The previous prime is 66393828887. The next prime is 66393828923. The reversal of 66393828889 is 98882839366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60516000000 + 5877828889 = 246000^2 + 76667^2 .

It is a cyclic number.

It is not a de Polignac number, because 66393828889 - 2¹ = 66393828887 is a prime.

Together with 66393828887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66393828887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33196914444 + 33196914445.

It is an arithmetic number, because the mean of its divisors is an integer number (33196914445).

Almost surely, 2^66393828889 is an apocalyptic number.

It is an amenable number.

66393828889 is a deficient number, since it is larger than the sum of its proper divisors (1).

66393828889 is an equidigital number, since it uses as much as digits as its factorization.

66393828889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 214990848, while the sum is 70.

The spelling of 66393828889 in words is "sixty-six billion, three hundred ninety-three million, eight hundred twenty-eight thousand, eight hundred eighty-nine".