205534661 has 8 divisors (see below), whose sum is σ = 207379224. Its totient is φ = 203695360.

The previous prime is 205534649. The next prime is 205534663. The reversal of 205534661 is 166435502.

It can be written as a sum of positive squares in 4 ways, for example, as 185761 + 205348900 = 431^2 + 14330^2 .

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 205534661 - 2¹⁰ = 205533637 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 (205534663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138041 + ... + 139521.

It is an arithmetic number, because the mean of its divisors is an integer number (25922403).

Almost surely, 2^205534661 is an apocalyptic number.

It is an amenable number.

205534661 is a deficient number, since it is larger than the sum of its proper divisors (1844563).

205534661 is a wasteful number, since it uses less digits than its factorization.

205534661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 205534661 is about 14336.4800770622. The cubic root of 205534661 is about 590.1490200999.

The spelling of 205534661 in words is "two hundred five million, five hundred thirty-four thousand, six hundred sixty-one".