6660303561 has 6 divisors (see below), whose sum is σ = 9620438490. Its totient is φ = 4440202368.

The previous prime is 6660303539. The next prime is 6660303569. The reversal of 6660303561 is 1653030666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4761000000 + 1899303561 = 69000^2 + 43581^2 .

It is not a de Polignac number, because 6660303561 - 2⁹ = 6660303049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6660303569) 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 5 ways as a sum of consecutive naturals, for example, 370016856 + ... + 370016873.

It is an arithmetic number, because the mean of its divisors is an integer number (1603406415).

Almost surely, 2^6660303561 is an apocalyptic number.

It is an amenable number.

6660303561 is a deficient number, since it is larger than the sum of its proper divisors (2960134929).

6660303561 is a wasteful number, since it uses less digits than its factorization.

6660303561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740033735 (or 740033732 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 6660303561 is about 81610.6828852694. The cubic root of 6660303561 is about 1881.4730759836.

The spelling of 6660303561 in words is "six billion, six hundred sixty million, three hundred three thousand, five hundred sixty-one".