204406673123 has 16 divisors (see below), whose sum is σ = 215578229856. Its totient is φ = 193565272320.

The previous prime is 204406673041. The next prime is 204406673129. The reversal of 204406673123 is 321376604402.

It is a cyclic number.

It is not a de Polignac number, because 204406673123 - 2²⁰ = 204405624547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204406673129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218465 + ... + 675677.

It is an arithmetic number, because the mean of its divisors is an integer number (13473639366).

Almost surely, 2^204406673123 is an apocalyptic number.

204406673123 is a deficient number, since it is larger than the sum of its proper divisors (11171556733).

204406673123 is a wasteful number, since it uses less digits than its factorization.

204406673123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457574.

The product of its (nonzero) digits is 145152, while the sum is 38.

The spelling of 204406673123 in words is "two hundred four billion, four hundred six million, six hundred seventy-three thousand, one hundred twenty-three".