204288992991 has 12 divisors (see below), whose sum is σ = 295245284880. Its totient is φ = 136118269440.

The previous prime is 204288992969. The next prime is 204288993011. The reversal of 204288992991 is 199299882402.

204288992991 is a `hidden beast` number, since 20 + 428 + 89 + 9 + 29 + 91 = 666.

It is not a de Polignac number, because 204288992991 - 2²⁵ = 204255438559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204288992191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6181986 + ... + 6214943.

It is an arithmetic number, because the mean of its divisors is an integer number (24603773740).

Almost surely, 2^204288992991 is an apocalyptic number.

204288992991 is a deficient number, since it is larger than the sum of its proper divisors (90956291889).

204288992991 is a wasteful number, since it uses less digits than its factorization.

204288992991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12398766 (or 12398763 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 63.

The spelling of 204288992991 in words is "two hundred four billion, two hundred eighty-eight million, nine hundred ninety-two thousand, nine hundred ninety-one".