6660648460666 has 4 divisors (see below), whose sum is σ = 9990972691002. Its totient is φ = 3330324230332.

The previous prime is 6660648460663. The next prime is 6660648460691.

6660648460666 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6204657537225 + 455990923441 = 2490915^2 + 675271^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6660648460598 and 6660648460607.

It is not an unprimeable number, because it can be changed into a prime (6660648460663) 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, 1665162115165 + ... + 1665162115168.

Almost surely, 2^{6660648460666} is an apocalyptic number.

6660648460666 is a deficient number, since it is larger than the sum of its proper divisors (3330324230336).

6660648460666 is a wasteful number, since it uses less digits than its factorization.

6660648460666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330324230335.

The product of its (nonzero) digits is 214990848, while the sum is 64.

The spelling of 6660648460666 in words is "six trillion, six hundred sixty billion, six hundred forty-eight million, four hundred sixty thousand, six hundred sixty-six".