205505200101 has 4 divisors (see below), whose sum is σ = 274006933472. Its totient is φ = 137003466732.

The previous prime is 205505200081. The next prime is 205505200141. The reversal of 205505200101 is 101002505502.

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 not a de Polignac number, because 205505200101 - 2²⁷ = 205370982373 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 (205505200141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34250866681 + ... + 34250866686.

It is an arithmetic number, because the mean of its divisors is an integer number (68501733368).

Almost surely, 2^205505200101 is an apocalyptic number.

It is an amenable number.

205505200101 is a deficient number, since it is larger than the sum of its proper divisors (68501733371).

205505200101 is an equidigital number, since it uses as much as digits as its factorization.

205505200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68501733370.

The product of its (nonzero) digits is 500, while the sum is 21.

Adding to 205505200101 its reverse (101002505502), we get a palindrome (306507705603).

The spelling of 205505200101 in words is "two hundred five billion, five hundred five million, two hundred thousand, one hundred one".