66684923009 has 8 divisors (see below), whose sum is σ = 68612736192. Its totient is φ = 64774246320.

The previous prime is 66684922963. The next prime is 66684923051. The reversal of 66684923009 is 90032948666.

66684923009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66684923009 - 2²⁴ = 66668145793 is a prime.

It is a super-2 number, since 2×66684923009² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66684923089) 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, 4276229 + ... + 4291794.

It is an arithmetic number, because the mean of its divisors is an integer number (8576592024).

Almost surely, 2^66684923009 is an apocalyptic number.

It is an amenable number.

66684923009 is a deficient number, since it is larger than the sum of its proper divisors (1927813183).

66684923009 is a wasteful number, since it uses less digits than its factorization.

66684923009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8568247.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 66684923009 in words is "sixty-six billion, six hundred eighty-four million, nine hundred twenty-three thousand, nine".