204585247853681 has 8 divisors (see below), whose sum is σ = 213489994222080. Its totient is φ = 195681312784672.

The previous prime is 204585247853647. The next prime is 204585247853699. The reversal of 204585247853681 is 186358742585402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204585247853681 is a prime.

It is a super-2 number, since 2×204585247853681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204585247853881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202309505 + ... + 203318238.

It is an arithmetic number, because the mean of its divisors is an integer number (26686249277760).

Almost surely, 2^{204585247853681} is an apocalyptic number.

It is an amenable number.

204585247853681 is a deficient number, since it is larger than the sum of its proper divisors (8904746368399).

204585247853681 is a wasteful number, since it uses less digits than its factorization.

204585247853681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405649695.

The product of its (nonzero) digits is 516096000, while the sum is 68.

The spelling of 204585247853681 in words is "two hundred four trillion, five hundred eighty-five billion, two hundred forty-seven million, eight hundred fifty-three thousand, six hundred eighty-one".