9666643333321 has 8 divisors (see below), whose sum is σ = 10415622417984. Its totient is φ = 8918434410960.

The previous prime is 9666643333309. The next prime is 9666643333397. The reversal of 9666643333321 is 1233333466669.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 9666643333321 - 2¹⁵ = 9666643300553 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9666643333121) 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, 192514501 + ... + 192564706.

It is an arithmetic number, because the mean of its divisors is an integer number (1301952802248).

Almost surely, 2^{9666643333321} is an apocalyptic number.

It is an amenable number.

9666643333321 is a deficient number, since it is larger than the sum of its proper divisors (748979084663).

9666643333321 is a wasteful number, since it uses less digits than its factorization.

9666643333321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385081151.

The product of its digits is 22674816, while the sum is 55.

The spelling of 9666643333321 in words is "nine trillion, six hundred sixty-six billion, six hundred forty-three million, three hundred thirty-three thousand, three hundred twenty-one".