205561200121045 has 16 divisors (see below), whose sum is σ = 248057868951360. Its totient is φ = 163526054708224.

The previous prime is 205561200121031. The next prime is 205561200121061. The reversal of 205561200121045 is 540121002165502.

205561200121045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 205561200121045 - 2¹¹ = 205561200118997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205561200121045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32186442 + ... + 38040628.

It is an arithmetic number, because the mean of its divisors is an integer number (15503616809460).

Almost surely, 2^{205561200121045} is an apocalyptic number.

It is an amenable number.

205561200121045 is a deficient number, since it is larger than the sum of its proper divisors (42496668830315).

205561200121045 is a wasteful number, since it uses less digits than its factorization.

205561200121045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5893604.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 205561200121045 its reverse (540121002165502), we get a palindrome (745682202286547).

The spelling of 205561200121045 in words is "two hundred five trillion, five hundred sixty-one billion, two hundred million, one hundred twenty-one thousand, forty-five".