204660605404505 has 8 divisors (see below), whose sum is σ = 245675781195912. Its totient is φ = 163673114516608.

The previous prime is 204660605404501. The next prime is 204660605404513. The reversal of 204660605404505 is 505404506066402.

It can be written as a sum of positive squares in 4 ways, for example, as 403228810009 + 204257376594496 = 635003^2 + 14291864^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 204660605404505 - 2² = 204660605404501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204660605404505.

It is not an unprimeable number, because it can be changed into a prime (204660605404501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6921209612 + ... + 6921239181.

It is an arithmetic number, because the mean of its divisors is an integer number (30709472649489).

Almost surely, 2^{204660605404505} is an apocalyptic number.

It is an amenable number.

204660605404505 is a deficient number, since it is larger than the sum of its proper divisors (41015175791407).

204660605404505 is a wasteful number, since it uses less digits than its factorization.

204660605404505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13842451755.

The product of its (nonzero) digits is 3456000, while the sum is 47.

The spelling of 204660605404505 in words is "two hundred four trillion, six hundred sixty billion, six hundred five million, four hundred four thousand, five hundred five".