66933805538 has 8 divisors (see below), whose sum is σ = 100419211200. Its totient is φ = 33460735140.

The previous prime is 66933805531. The next prime is 66933805571. The reversal of 66933805538 is 83550833966.

66933805538 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 Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66933805531) 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, 3070238 + ... + 3091961.

It is an arithmetic number, because the mean of its divisors is an integer number (12552401400).

Almost surely, 2^66933805538 is an apocalyptic number.

66933805538 is a deficient number, since it is larger than the sum of its proper divisors (33485405662).

66933805538 is a wasteful number, since it uses less digits than its factorization.

66933805538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6167632.

The product of its (nonzero) digits is 13996800, while the sum is 56.

The spelling of 66933805538 in words is "sixty-six billion, nine hundred thirty-three million, eight hundred five thousand, five hundred thirty-eight".