6650506661 has 2 divisors, whose sum is σ = 6650506662. Its totient is φ = 6650506660.

The previous prime is 6650506619. The next prime is 6650506699. The reversal of 6650506661 is 1666050566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6533650561 + 116856100 = 80831^2 + 10810^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650506661 - 2¹⁴ = 6650490277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6650506061) 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 as a sum of consecutive naturals, namely, 3325253330 + 3325253331.

It is an arithmetic number, because the mean of its divisors is an integer number (3325253331).

Almost surely, 2^6650506661 is an apocalyptic number.

It is an amenable number.

6650506661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6650506661 is an equidigital number, since it uses as much as digits as its factorization.

6650506661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 6650506661 is about 81550.6386302400. The cubic root of 6650506661 is about 1880.5501126108.

The spelling of 6650506661 in words is "six billion, six hundred fifty million, five hundred six thousand, six hundred sixty-one".