205414686149 has 4 divisors (see below), whose sum is σ = 216225985440. Its totient is φ = 194603386860.

The previous prime is 205414686133. The next prime is 205414686163. The reversal of 205414686149 is 941686414502.

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 205414686149 - 2⁴ = 205414686133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 205414686097 and 205414686106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205414626149) 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, 5405649617 + ... + 5405649654.

It is an arithmetic number, because the mean of its divisors is an integer number (54056496360).

Almost surely, 2^205414686149 is an apocalyptic number.

It is an amenable number.

205414686149 is a deficient number, since it is larger than the sum of its proper divisors (10811299291).

205414686149 is a wasteful number, since it uses less digits than its factorization.

205414686149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10811299290.

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

The spelling of 205414686149 in words is "two hundred five billion, four hundred fourteen million, six hundred eighty-six thousand, one hundred forty-nine".