6611661187 has 2 divisors, whose sum is σ = 6611661188. Its totient is φ = 6611661186.

The previous prime is 6611661163. The next prime is 6611661191. The reversal of 6611661187 is 7811661166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6611661187 is a prime.

It is not a weakly prime, because it can be changed into another prime (6611661487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305830593 + 3305830594.

It is an arithmetic number, because the mean of its divisors is an integer number (3305830594).

Almost surely, 2^6611661187 is an apocalyptic number.

6611661187 is a deficient number, since it is larger than the sum of its proper divisors (1).

6611661187 is an equidigital number, since it uses as much as digits as its factorization.

6611661187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 6611661187 is about 81312.1220175688. The cubic root of 6611661187 is about 1876.8815423247.

The spelling of 6611661187 in words is "six billion, six hundred eleven million, six hundred sixty-one thousand, one hundred eighty-seven".