205560730661 has 8 divisors (see below), whose sum is σ = 241497921504. Its totient is φ = 172498515120.

The previous prime is 205560730643. The next prime is 205560730681. The reversal of 205560730661 is 166037065502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205560730661 - 2⁶ = 205560730597 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 (205560730681) 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 7 ways as a sum of consecutive naturals, for example, 718743671 + ... + 718743956.

It is an arithmetic number, because the mean of its divisors is an integer number (30187240188).

Almost surely, 2^205560730661 is an apocalyptic number.

It is an amenable number.

205560730661 is a deficient number, since it is larger than the sum of its proper divisors (35937190843).

205560730661 is a wasteful number, since it uses less digits than its factorization.

205560730661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437487651.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 205560730661 in words is "two hundred five billion, five hundred sixty million, seven hundred thirty thousand, six hundred sixty-one".