66111100055111 has 2 divisors, whose sum is σ = 66111100055112. Its totient is φ = 66111100055110.

The previous prime is 66111100055107. The next prime is 66111100055113. The reversal of 66111100055111 is 11155000111166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66111100055111 - 2² = 66111100055107 is a prime.

Together with 66111100055113, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66111100055113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33055550027555 + 33055550027556.

It is an arithmetic number, because the mean of its divisors is an integer number (33055550027556).

Almost surely, 2^{66111100055111} is an apocalyptic number.

66111100055111 is a deficient number, since it is larger than the sum of its proper divisors (1).

66111100055111 is an equidigital number, since it uses as much as digits as its factorization.

66111100055111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 29.

Adding to 66111100055111 its reverse (11155000111166), we get a palindrome (77266100166277).

The spelling of 66111100055111 in words is "sixty-six trillion, one hundred eleven billion, one hundred million, fifty-five thousand, one hundred eleven".