204605666555 has 16 divisors (see below), whose sum is σ = 249622621344. Its totient is φ = 160955508480.

The previous prime is 204605666533. The next prime is 204605666569. The reversal of 204605666555 is 555666506402.

It is not a de Polignac number, because 204605666555 - 2⁸ = 204605666299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002512 + ... + 1189218.

It is an arithmetic number, because the mean of its divisors is an integer number (15601413834).

Almost surely, 2^204605666555 is an apocalyptic number.

204605666555 is a deficient number, since it is larger than the sum of its proper divisors (45016954789).

204605666555 is a wasteful number, since it uses less digits than its factorization.

204605666555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190366.

The product of its (nonzero) digits is 6480000, while the sum is 50.

The spelling of 204605666555 in words is "two hundred four billion, six hundred five million, six hundred sixty-six thousand, five hundred fifty-five".