204531130566 has 40 divisors (see below), whose sum is σ = 523772845200. Its totient is φ = 58437465552.

The previous prime is 204531130553. The next prime is 204531130667. The reversal of 204531130566 is 665031135402.

204531130566 is a `hidden beast` number, since 2 + 0 + 4 + 53 + 11 + 30 + 566 = 666.

It is a super-2 number, since 2×204531130566² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204531130566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 90180141 + ... + 90182408.

It is an arithmetic number, because the mean of its divisors is an integer number (13094321130).

Almost surely, 2^204531130566 is an apocalyptic number.

204531130566 is an abundant number, since it is smaller than the sum of its proper divisors (319241714634).

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

204531130566 is a wasteful number, since it uses less digits than its factorization.

204531130566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180362570 (or 180362561 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 204531130566 its reverse (665031135402), we get a palindrome (869562265968).

The spelling of 204531130566 in words is "two hundred four billion, five hundred thirty-one million, one hundred thirty thousand, five hundred sixty-six".