6660568650667 has 8 divisors (see below), whose sum is σ = 6689761664400. Its totient is φ = 6631376572704.

The previous prime is 6660568650629. The next prime is 6660568650713. The reversal of 6660568650667 is 7660568650666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660568650667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660568650167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16716813 + ... + 17110609.

It is an arithmetic number, because the mean of its divisors is an integer number (836220208050).

Almost surely, 2^{6660568650667} is an apocalyptic number.

6660568650667 is a deficient number, since it is larger than the sum of its proper divisors (29193013733).

6660568650667 is a wasteful number, since it uses less digits than its factorization.

6660568650667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467885.

The product of its (nonzero) digits is 391910400, while the sum is 67.

Subtracting 6660568650667 from its reverse (7660568650666), we obtain a palindrome (999999999999).

The spelling of 6660568650667 in words is "six trillion, six hundred sixty billion, five hundred sixty-eight million, six hundred fifty thousand, six hundred sixty-seven".