204240310513 has 6 divisors (see below), whose sum is σ = 215555563554. Its totient is φ = 193490820144.

The previous prime is 204240310507. The next prime is 204240310531. The reversal of 204240310513 is 315013042402.

It can be written as a sum of positive squares in only one way, i.e., 183536841744 + 20703468769 = 428412^2 + 143887^2 .

It is not a de Polignac number, because 204240310513 - 2¹⁷ = 204240179441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204240310583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282880956 + ... + 282881677.

It is an arithmetic number, because the mean of its divisors is an integer number (35925927259).

Almost surely, 2^204240310513 is an apocalyptic number.

It is an amenable number.

204240310513 is a deficient number, since it is larger than the sum of its proper divisors (11315253041).

204240310513 is an equidigital number, since it uses as much as digits as its factorization.

204240310513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565762671 (or 565762652 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 204240310513 its reverse (315013042402), we get a palindrome (519253352915).

The spelling of 204240310513 in words is "two hundred four billion, two hundred forty million, three hundred ten thousand, five hundred thirteen".