204557469991 has 16 divisors (see below), whose sum is σ = 235582516224. Its totient is φ = 173988255744.

The previous prime is 204557469959. The next prime is 204557470021. The reversal of 204557469991 is 199964755402.

It is a cyclic number.

It is not a de Polignac number, because 204557469991 - 2⁵ = 204557469959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204557469901) 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, 256966 + ... + 689308.

It is an arithmetic number, because the mean of its divisors is an integer number (14723907264).

Almost surely, 2^204557469991 is an apocalyptic number.

204557469991 is a deficient number, since it is larger than the sum of its proper divisors (31025046233).

204557469991 is a wasteful number, since it uses less digits than its factorization.

204557469991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432870.

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 204557469991 in words is "two hundred four billion, five hundred fifty-seven million, four hundred sixty-nine thousand, nine hundred ninety-one".