204817368861 has 48 divisors (see below), whose sum is σ = 356049907200. Its totient is φ = 110833912224.

The previous prime is 204817368853. The next prime is 204817368863. The reversal of 204817368861 is 168863718402.

204817368861 is a `hidden beast` number, since 20 + 481 + 7 + 3 + 6 + 88 + 61 = 666.

It is not a de Polignac number, because 204817368861 - 2³ = 204817368853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204817368798 and 204817368807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204817368863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3053890 + ... + 3120236.

It is an arithmetic number, because the mean of its divisors is an integer number (7417706400).

Almost surely, 2^204817368861 is an apocalyptic number.

204817368861 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204817368861 is a deficient number, since it is larger than the sum of its proper divisors (151232538339).

204817368861 is a wasteful number, since it uses less digits than its factorization.

204817368861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68958 (or 68955 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 204817368861 in words is "two hundred four billion, eight hundred seventeen million, three hundred sixty-eight thousand, eight hundred sixty-one".