6610616661 has 16 divisors (see below), whose sum is σ = 9671031360. Its totient is φ = 3983272320.

The previous prime is 6610616611. The next prime is 6610616681. The reversal of 6610616661 is 1666160166.

It is a happy number.

It is not a de Polignac number, because 6610616661 - 2⁷ = 6610616533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6610616611) 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 in 15 ways as a sum of consecutive naturals, for example, 573256 + ... + 584673.

It is an arithmetic number, because the mean of its divisors is an integer number (604439460).

Almost surely, 2^6610616661 is an apocalyptic number.

It is an amenable number.

6610616661 is a deficient number, since it is larger than the sum of its proper divisors (3060414699).

6610616661 is a wasteful number, since it uses less digits than its factorization.

6610616661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158116.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 6610616661 is about 81305.6988224073. The cubic root of 6610616661 is about 1876.7826990455.

The spelling of 6610616661 in words is "six billion, six hundred ten million, six hundred sixteen thousand, six hundred sixty-one".