23491305205 has 4 divisors (see below), whose sum is σ = 28189566252. Its totient is φ = 18793044160.

The previous prime is 23491305199. The next prime is 23491305223. The reversal of 23491305205 is 50250319432.

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 7625131684 + 15866173521 = 87322^2 + 125961^2 .

It is not a de Polignac number, because 23491305205 - 2⁷ = 23491305077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2349130516 + ... + 2349130525.

It is an arithmetic number, because the mean of its divisors is an integer number (7047391563).

Almost surely, 2^23491305205 is an apocalyptic number.

It is an amenable number.

23491305205 is a deficient number, since it is larger than the sum of its proper divisors (4698261047).

23491305205 is an equidigital number, since it uses as much as digits as its factorization.

23491305205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4698261046.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 23491305205 in words is "twenty-three billion, four hundred ninety-one million, three hundred five thousand, two hundred five".