204685684406 has 16 divisors (see below), whose sum is σ = 359448032160. Its totient is φ = 85582864320.

The previous prime is 204685684397. The next prime is 204685684417. The reversal of 204685684406 is 604486586402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 178297061 + ... + 178298208.

It is an arithmetic number, because the mean of its divisors is an integer number (22465502010).

Almost surely, 2^204685684406 is an apocalyptic number.

204685684406 is a deficient number, since it is larger than the sum of its proper divisors (154762347754).

204685684406 is a wasteful number, since it uses less digits than its factorization.

204685684406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356595319.

The product of its (nonzero) digits is 8847360, while the sum is 53.

The spelling of 204685684406 in words is "two hundred four billion, six hundred eighty-five million, six hundred eighty-four thousand, four hundred six".