18973605806 has 8 divisors (see below), whose sum is σ = 28624920264. Its totient is φ = 9431965720.

The previous prime is 18973605767. The next prime is 18973605811. The reversal of 18973605806 is 60850637981.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27418160 + ... + 27418851.

It is an arithmetic number, because the mean of its divisors is an integer number (3578115033).

Almost surely, 2^18973605806 is an apocalyptic number.

18973605806 is a deficient number, since it is larger than the sum of its proper divisors (9651314458).

18973605806 is a wasteful number, since it uses less digits than its factorization.

18973605806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54837186.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 18973605806 in words is "eighteen billion, nine hundred seventy-three million, six hundred five thousand, eight hundred six".