205849343012081 has 4 divisors (see below), whose sum is σ = 209338314927600. Its totient is φ = 202360371096564.

The previous prime is 205849343012051. The next prime is 205849343012141. The reversal of 205849343012081 is 180210343948502.

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 205849343012081 - 2⁶ = 205849343012017 is a prime.

It is a super-2 number, since 2×205849343012081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205849343012021) 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, 1744485957671 + ... + 1744485957788.

It is an arithmetic number, because the mean of its divisors is an integer number (52334578731900).

Almost surely, 2^{205849343012081} is an apocalyptic number.

It is an amenable number.

205849343012081 is a deficient number, since it is larger than the sum of its proper divisors (3488971915519).

205849343012081 is an equidigital number, since it uses as much as digits as its factorization.

205849343012081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488971915518.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 205849343012081 in words is "two hundred five trillion, eight hundred forty-nine billion, three hundred forty-three million, twelve thousand, eighty-one".