66610111103 has 2 divisors, whose sum is σ = 66610111104. Its totient is φ = 66610111102.

The previous prime is 66610111079. The next prime is 66610111159. The reversal of 66610111103 is 30111101666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66610111103 - 2³⁰ = 65536369279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66610111163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33305055551 + 33305055552.

It is an arithmetic number, because the mean of its divisors is an integer number (33305055552).

Almost surely, 2^66610111103 is an apocalyptic number.

66610111103 is a deficient number, since it is larger than the sum of its proper divisors (1).

66610111103 is an equidigital number, since it uses as much as digits as its factorization.

66610111103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

Adding to 66610111103 its reverse (30111101666), we get a palindrome (96721212769).

The spelling of 66610111103 in words is "sixty-six billion, six hundred ten million, one hundred eleven thousand, one hundred three".