6611661165 has 32 divisors (see below), whose sum is σ = 11503676160. Its totient is φ = 3229092864.

The previous prime is 6611661163. The next prime is 6611661187. The reversal of 6611661165 is 5611661166.

It is not a de Polignac number, because 6611661165 - 2¹ = 6611661163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6611661163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 340945 + ... + 359814.

It is an arithmetic number, because the mean of its divisors is an integer number (359489880).

Almost surely, 2^6611661165 is an apocalyptic number.

It is an amenable number.

6611661165 is a deficient number, since it is larger than the sum of its proper divisors (4892014995).

6611661165 is a wasteful number, since it uses less digits than its factorization.

6611661165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700821.

The product of its digits is 38880, while the sum is 39.

The square root of 6611661165 is about 81312.1218822876. The cubic root of 6611661165 is about 1876.8815402429.

Subtracting from 6611661165 its reverse (5611661166), we obtain a palindrome (999999999).

The spelling of 6611661165 in words is "six billion, six hundred eleven million, six hundred sixty-one thousand, one hundred sixty-five".