66111911 has 2 divisors, whose sum is σ = 66111912. Its totient is φ = 66111910.

The previous prime is 66111883. The next prime is 66111923. The reversal of 66111911 is 11911166.

It is a strong prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 11611199 and 99111611.

It is a cyclic number.

It is not a de Polignac number, because 66111911 - 2⁶ = 66111847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66113911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33055955 + 33055956.

It is an arithmetic number, because the mean of its divisors is an integer number (33055956).

Almost surely, 2^66111911 is an apocalyptic number.

66111911 is a deficient number, since it is larger than the sum of its proper divisors (1).

66111911 is an equidigital number, since it uses as much as digits as its factorization.

66111911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 26.

The square root of 66111911 is about 8130.9231333226. The cubic root of 66111911 is about 404.3522868260.

It can be divided in two parts, 6611 and 1911, that multiplied together give a palindrome (12633621).

The spelling of 66111911 in words is "sixty-six million, one hundred eleven thousand, nine hundred eleven".