66573813818 has 16 divisors (see below), whose sum is σ = 100397029824. Its totient is φ = 33108504000.

The previous prime is 66573813797. The next prime is 66573813829. The reversal of 66573813818 is 81831837566.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273746 + ... + 456162.

It is an arithmetic number, because the mean of its divisors is an integer number (6274814364).

Almost surely, 2^66573813818 is an apocalyptic number.

66573813818 is a deficient number, since it is larger than the sum of its proper divisors (33823216006).

66573813818 is a wasteful number, since it uses less digits than its factorization.

66573813818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183397.

The product of its digits is 5806080, while the sum is 56.

The spelling of 66573813818 in words is "sixty-six billion, five hundred seventy-three million, eight hundred thirteen thousand, eight hundred eighteen".