206365561 has 8 divisors (see below), whose sum is σ = 209715264. Its totient is φ = 203023920.

The previous prime is 206365531. The next prime is 206365571. The reversal of 206365561 is 165563602.

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 206365561 - 2⁵ = 206365529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206365531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69636 + ... + 72538.

It is an arithmetic number, because the mean of its divisors is an integer number (26214408).

Almost surely, 2^206365561 is an apocalyptic number.

It is an amenable number.

206365561 is a deficient number, since it is larger than the sum of its proper divisors (3349703).

206365561 is a wasteful number, since it uses less digits than its factorization.

206365561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 206365561 is about 14365.4293705409. The cubic root of 206365561 is about 590.9432016823.

The spelling of 206365561 in words is "two hundred six million, three hundred sixty-five thousand, five hundred sixty-one".