205423323345 has 16 divisors (see below), whose sum is σ = 365197019520. Its totient is φ = 109559105712.

The previous prime is 205423323331. The next prime is 205423323349. The reversal of 205423323345 is 543323324502.

It is a happy number.

205423323345 is a `hidden beast` number, since 20 + 542 + 33 + 23 + 3 + 45 = 666.

It is not a de Polignac number, because 205423323345 - 2⁸ = 205423323089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205423323349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 760826989 + ... + 760827258.

It is an arithmetic number, because the mean of its divisors is an integer number (22824813720).

Almost surely, 2^205423323345 is an apocalyptic number.

It is an amenable number.

205423323345 is a deficient number, since it is larger than the sum of its proper divisors (159773696175).

205423323345 is a wasteful number, since it uses less digits than its factorization.

205423323345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521654261 (or 1521654255 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 36.

Adding to 205423323345 its reverse (543323324502), we get a palindrome (748746647847).

The spelling of 205423323345 in words is "two hundred five billion, four hundred twenty-three million, three hundred twenty-three thousand, three hundred forty-five".