204112515517 has 4 divisors (see below), whose sum is σ = 209090869596. Its totient is φ = 199134161440.

The previous prime is 204112515493. The next prime is 204112515533. The reversal of 204112515517 is 715515211402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38549788281 + 165562727236 = 196341^2 + 406894^2 .

It is a cyclic number.

It is not a de Polignac number, because 204112515517 - 2⁷ = 204112515389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204112515587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2489176978 + ... + 2489177059.

It is an arithmetic number, because the mean of its divisors is an integer number (52272717399).

Almost surely, 2^204112515517 is an apocalyptic number.

It is an amenable number.

204112515517 is a deficient number, since it is larger than the sum of its proper divisors (4978354079).

204112515517 is an equidigital number, since it uses as much as digits as its factorization.

204112515517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978354078.

The product of its (nonzero) digits is 14000, while the sum is 34.

Adding to 204112515517 its reverse (715515211402), we get a palindrome (919627726919).

The spelling of 204112515517 in words is "two hundred four billion, one hundred twelve million, five hundred fifteen thousand, five hundred seventeen".