204664513 has 8 divisors (see below), whose sum is σ = 224176680. Its totient is φ = 185982720.

The previous prime is 204664507. The next prime is 204664531. The reversal of 204664513 is 315466402.

204664513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6615184 + 198049329 = 2572^2 + 14073^2 .

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

It is not a de Polignac number, because 204664513 - 2⁹ = 204664001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204664553) 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, 207078 + ... + 208063.

It is an arithmetic number, because the mean of its divisors is an integer number (28022085).

Almost surely, 2^204664513 is an apocalyptic number.

It is an amenable number.

204664513 is a deficient number, since it is larger than the sum of its proper divisors (19512167).

204664513 is a wasteful number, since it uses less digits than its factorization.

204664513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415187.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 204664513 is about 14306.1005518625. The cubic root of 204664513 is about 589.3150271560.

The spelling of 204664513 in words is "two hundred four million, six hundred sixty-four thousand, five hundred thirteen".