205542110423 has 4 divisors (see below), whose sum is σ = 221353042008. Its totient is φ = 189731178840.

The previous prime is 205542110419. The next prime is 205542110437. The reversal of 205542110423 is 324011245502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205542110423 - 2² = 205542110419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205542110453) 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, 7905465773 + ... + 7905465798.

It is an arithmetic number, because the mean of its divisors is an integer number (55338260502).

Almost surely, 2^205542110423 is an apocalyptic number.

205542110423 is a deficient number, since it is larger than the sum of its proper divisors (15810931585).

205542110423 is a wasteful number, since it uses less digits than its factorization.

205542110423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15810931584.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 205542110423 its reverse (324011245502), we get a palindrome (529553355925).

The spelling of 205542110423 in words is "two hundred five billion, five hundred forty-two million, one hundred ten thousand, four hundred twenty-three".