611666216111 has 2 divisors, whose sum is σ = 611666216112. Its totient is φ = 611666216110.

The previous prime is 611666216087. The next prime is 611666216171. The reversal of 611666216111 is 111612666116.

It is a happy number.

611666216111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611666216111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611666216171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305833108055 + 305833108056.

It is an arithmetic number, because the mean of its divisors is an integer number (305833108056).

Almost surely, 2^611666216111 is an apocalyptic number.

611666216111 is a deficient number, since it is larger than the sum of its proper divisors (1).

611666216111 is an equidigital number, since it uses as much as digits as its factorization.

611666216111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The spelling of 611666216111 in words is "six hundred eleven billion, six hundred sixty-six million, two hundred sixteen thousand, one hundred eleven".