204242001985 has 32 divisors (see below), whose sum is σ = 282695339520. Its totient is φ = 138756645888.

The previous prime is 204242001983. The next prime is 204242002051. The reversal of 204242001985 is 589100242402.

It is not a de Polignac number, because 204242001985 - 2¹ = 204242001983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204242001983) 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 31 ways as a sum of consecutive naturals, for example, 11472471 + ... + 11490259.

It is an arithmetic number, because the mean of its divisors is an integer number (8834229360).

Almost surely, 2^204242001985 is an apocalyptic number.

It is an amenable number.

204242001985 is a deficient number, since it is larger than the sum of its proper divisors (78453337535).

204242001985 is a wasteful number, since it uses less digits than its factorization.

204242001985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20817.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 204242001985 in words is "two hundred four billion, two hundred forty-two million, one thousand, nine hundred eighty-five".