205644734101 has 4 divisors (see below), whose sum is σ = 206710251052. Its totient is φ = 204579217152.

The previous prime is 205644734081. The next prime is 205644734213. The reversal of 205644734101 is 101437446502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 87260569201 + 118384164900 = 295399^2 + 344070^2 .

It is a cyclic number.

It is not a de Polignac number, because 205644734101 - 2²⁹ = 205107863189 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 (205644794101) 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, 532758186 + ... + 532758571.

It is an arithmetic number, because the mean of its divisors is an integer number (51677562763).

Almost surely, 2^205644734101 is an apocalyptic number.

It is an amenable number.

205644734101 is a deficient number, since it is larger than the sum of its proper divisors (1065516951).

205644734101 is a wasteful number, since it uses less digits than its factorization.

205644734101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065516950.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 205644734101 in words is "two hundred five billion, six hundred forty-four million, seven hundred thirty-four thousand, one hundred one".