6610206661 has 2 divisors, whose sum is σ = 6610206662. Its totient is φ = 6610206660.

The previous prime is 6610206649. The next prime is 6610206697. The reversal of 6610206661 is 1666020166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5255525025 + 1354681636 = 72495^2 + 36806^2 .

It is a cyclic number.

It is not a de Polignac number, because 6610206661 - 2⁹ = 6610206149 is a prime.

It is a super-2 number, since 2×6610206661² = 87389664202257537842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6610206641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305103330 + 3305103331.

It is an arithmetic number, because the mean of its divisors is an integer number (3305103331).

Almost surely, 2^6610206661 is an apocalyptic number.

It is an amenable number.

6610206661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6610206661 is an equidigital number, since it uses as much as digits as its factorization.

6610206661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 6610206661 is about 81303.1774348334. The cubic root of 6610206661 is about 1876.7438979848.

The spelling of 6610206661 in words is "six billion, six hundred ten million, two hundred six thousand, six hundred sixty-one".