6111166661 has 2 divisors, whose sum is σ = 6111166662. Its totient is φ = 6111166660.

The previous prime is 6111166619. The next prime is 6111166687. The reversal of 6111166661 is 1666611116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5607164161 + 504002500 = 74881^2 + 22450^2 .

It is a cyclic number.

It is not a de Polignac number, because 6111166661 - 2¹⁰ = 6111165637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6111156661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3055583330 + 3055583331.

It is an arithmetic number, because the mean of its divisors is an integer number (3055583331).

Almost surely, 2^6111166661 is an apocalyptic number.

It is an amenable number.

6111166661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6111166661 is an equidigital number, since it uses as much as digits as its factorization.

6111166661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 6111166661 is about 78173.9512945329. The cubic root of 6111166661 is about 1828.2743904376.

Adding to 6111166661 its reverse (1666611116), we get a palindrome (7777777777).

The spelling of 6111166661 in words is "six billion, one hundred eleven million, one hundred sixty-six thousand, six hundred sixty-one".