204864471656 has 24 divisors (see below), whose sum is σ = 413677965330. Its totient is φ = 94550702688.

The previous prime is 204864471631. The next prime is 204864471667. The reversal of 204864471656 is 656174468402.

It can be written as a sum of positive squares in only one way, i.e., 196985068900 + 7879402756 = 443830^2 + 88766^2 .

It is a junction number, because it is equal to n+sod(n) for n = 204864471598 and 204864471607.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4593641 + ... + 4638023.

Almost surely, 2^204864471656 is an apocalyptic number.

204864471656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

204864471656 is an abundant number, since it is smaller than the sum of its proper divisors (208813493674).

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

204864471656 is an frugal number, since it uses more digits than its factorization.

204864471656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88785 (or 44398 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 53.

The spelling of 204864471656 in words is "two hundred four billion, eight hundred sixty-four million, four hundred seventy-one thousand, six hundred fifty-six".