66643513773 has 8 divisors (see below), whose sum is σ = 88942568736. Its totient is φ = 44386734000.

The previous prime is 66643513763. The next prime is 66643513787. The reversal of 66643513773 is 37731534666.

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

It is a de Polignac number, because none of the positive numbers 2^k-66643513773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66643513763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10565118 + ... + 10571423.

It is an arithmetic number, because the mean of its divisors is an integer number (11117821092).

Almost surely, 2^66643513773 is an apocalyptic number.

It is an amenable number.

66643513773 is a deficient number, since it is larger than the sum of its proper divisors (22299054963).

66643513773 is a wasteful number, since it uses less digits than its factorization.

66643513773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21137595.

The product of its digits is 5715360, while the sum is 51.

The spelling of 66643513773 in words is "sixty-six billion, six hundred forty-three million, five hundred thirteen thousand, seven hundred seventy-three".