204969717990 has 96 divisors (see below), whose sum is σ = 551487100320. Its totient is φ = 52755698688.

The previous prime is 204969717943. The next prime is 204969718067. The reversal of 204969717990 is 99717969402.

204969717990 is a `hidden beast` number, since 2 + 0 + 496 + 9 + 71 + 79 + 9 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8661214 + ... + 8684846.

It is an arithmetic number, because the mean of its divisors is an integer number (5744657295).

Almost surely, 2^204969717990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204969717990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275743550160).

204969717990 is an abundant number, since it is smaller than the sum of its proper divisors (346517382330).

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

204969717990 is a wasteful number, since it uses less digits than its factorization.

204969717990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26998 (or 26995 counting only the distinct ones).

The product of its (nonzero) digits is 15431472, while the sum is 63.

The spelling of 204969717990 in words is "two hundred four billion, nine hundred sixty-nine million, seven hundred seventeen thousand, nine hundred ninety".