66605011111 has 2 divisors, whose sum is σ = 66605011112. Its totient is φ = 66605011110.

The previous prime is 66605011097. The next prime is 66605011117. The reversal of 66605011111 is 11111050666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66605011111 - 2¹⁵ = 66604978343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66605011111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66605011117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33302505555 + 33302505556.

It is an arithmetic number, because the mean of its divisors is an integer number (33302505556).

Almost surely, 2^66605011111 is an apocalyptic number.

66605011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

66605011111 is an equidigital number, since it uses as much as digits as its factorization.

66605011111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 28.

Adding to 66605011111 its reverse (11111050666), we get a palindrome (77716061777).

The spelling of 66605011111 in words is "sixty-six billion, six hundred five million, eleven thousand, one hundred eleven".