205609950313 has 4 divisors (see below), whose sum is σ = 205888178320. Its totient is φ = 205331722308.

The previous prime is 205609950307. The next prime is 205609950331. The reversal of 205609950313 is 313059906502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205609950313 - 2²¹ = 205607853161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205609950313.

It is not an unprimeable number, because it can be changed into a prime (205609953313) 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, 139112895 + ... + 139114372.

It is an arithmetic number, because the mean of its divisors is an integer number (51472044580).

Almost surely, 2^205609950313 is an apocalyptic number.

It is an amenable number.

205609950313 is a deficient number, since it is larger than the sum of its proper divisors (278228007).

205609950313 is an equidigital number, since it uses as much as digits as its factorization.

205609950313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278228006.

The product of its (nonzero) digits is 218700, while the sum is 43.

The spelling of 205609950313 in words is "two hundred five billion, six hundred nine million, nine hundred fifty thousand, three hundred thirteen".