205188043493 has 4 divisors (see below), whose sum is σ = 205484987808. Its totient is φ = 204891099180.

The previous prime is 205188043483. The next prime is 205188043499. The reversal of 205188043493 is 394340881502.

205188043493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 394340881502 = 2 ⋅197170440751.

It is a cyclic number.

It is not a de Polignac number, because 205188043493 - 2⁴ = 205188043477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205188043499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148471121 + ... + 148472502.

It is an arithmetic number, because the mean of its divisors is an integer number (51371246952).

Almost surely, 2^205188043493 is an apocalyptic number.

It is an amenable number.

205188043493 is a deficient number, since it is larger than the sum of its proper divisors (296944315).

205188043493 is an equidigital number, since it uses as much as digits as its factorization.

205188043493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296944314.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 205188043493 in words is "two hundred five billion, one hundred eighty-eight million, forty-three thousand, four hundred ninety-three".