66666330643 has 4 divisors (see below), whose sum is σ = 72726906168. Its totient is φ = 60605755120.

The previous prime is 66666330631. The next prime is 66666330667. The reversal of 66666330643 is 34603366666.

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

It is a cyclic number.

It is not a de Polignac number, because 66666330643 - 2¹⁷ = 66666199571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66666330683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030287746 + ... + 3030287767.

It is an arithmetic number, because the mean of its divisors is an integer number (18181726542).

Almost surely, 2^66666330643 is an apocalyptic number.

66666330643 is a deficient number, since it is larger than the sum of its proper divisors (6060575525).

66666330643 is a wasteful number, since it uses less digits than its factorization.

66666330643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060575524.

The product of its (nonzero) digits is 5038848, while the sum is 49.

The spelling of 66666330643 in words is "sixty-six billion, six hundred sixty-six million, three hundred thirty thousand, six hundred forty-three".