6660568650666 has 64 divisors (see below), whose sum is σ = 15473429637120. Its totient is φ = 1871941579200.

The previous prime is 6660568650629. The next prime is 6660568650713.

6660568650666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6660568650597 and 6660568650606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284355 + ... + 3660873.

It is an arithmetic number, because the mean of its divisors is an integer number (241772338080).

Almost surely, 2^{6660568650666} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6660568650666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7736714818560).

6660568650666 is an abundant number, since it is smaller than the sum of its proper divisors (8812860986454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6660568650666 is a wasteful number, since it uses less digits than its factorization.

6660568650666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377299.

The product of its (nonzero) digits is 335923200, while the sum is 66.

The spelling of 6660568650666 in words is "six trillion, six hundred sixty billion, five hundred sixty-eight million, six hundred fifty thousand, six hundred sixty-six".