204778504511 has 16 divisors (see below), whose sum is σ = 253843087680. Its totient is φ = 161170206720.

The previous prime is 204778504507. The next prime is 204778504531. The reversal of 204778504511 is 115405877402.

204778504511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 204778504511 - 2² = 204778504507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204778504501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20980826 + ... + 20990583.

It is an arithmetic number, because the mean of its divisors is an integer number (15865192980).

Almost surely, 2^204778504511 is an apocalyptic number.

204778504511 is a deficient number, since it is larger than the sum of its proper divisors (49064583169).

204778504511 is a wasteful number, since it uses less digits than its factorization.

204778504511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41971474.

The product of its (nonzero) digits is 313600, while the sum is 44.

The spelling of 204778504511 in words is "two hundred four billion, seven hundred seventy-eight million, five hundred four thousand, five hundred eleven".