205402509713 has 4 divisors (see below), whose sum is σ = 205412444160. Its totient is φ = 205392575268.

The previous prime is 205402509709. The next prime is 205402509757. The reversal of 205402509713 is 317905204502.

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 205402509713 - 2² = 205402509709 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205402509773) 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, 4936145 + ... + 4977582.

It is an arithmetic number, because the mean of its divisors is an integer number (51353111040).

Almost surely, 2^205402509713 is an apocalyptic number.

It is an amenable number.

205402509713 is a deficient number, since it is larger than the sum of its proper divisors (9934447).

205402509713 is an equidigital number, since it uses as much as digits as its factorization.

205402509713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9934446.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 205402509713 in words is "two hundred five billion, four hundred two million, five hundred nine thousand, seven hundred thirteen".