204686004656 has 80 divisors (see below), whose sum is σ = 459783667200. Its totient is φ = 86456553984.

The previous prime is 204686004629. The next prime is 204686004659. The reversal of 204686004656 is 656400686402.

It is a self number, because there is not a number n which added to its sum of digits gives 204686004656.

It is not an unprimeable number, because it can be changed into a prime (204686004659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11920205 + ... + 11937363.

It is an arithmetic number, because the mean of its divisors is an integer number (5747295840).

Almost surely, 2^204686004656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204686004656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229891833600).

204686004656 is an abundant number, since it is smaller than the sum of its proper divisors (255097662544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204686004656 is a wasteful number, since it uses less digits than its factorization.

204686004656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18706 (or 18700 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 204686004656 in words is "two hundred four billion, six hundred eighty-six million, four thousand, six hundred fifty-six".