206216345 has 8 divisors (see below), whose sum is σ = 247661064. Its totient is φ = 164838784.

The previous prime is 206216333. The next prime is 206216359. The reversal of 206216345 is 543612602.

It can be written as a sum of positive squares in 4 ways, for example, as 86620249 + 119596096 = 9307^2 + 10936^2 .

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 206216345 - 2²⁰ = 205167769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9764 + ... + 22533.

It is an arithmetic number, because the mean of its divisors is an integer number (30957633).

Almost surely, 2^206216345 is an apocalyptic number.

It is an amenable number.

206216345 is a deficient number, since it is larger than the sum of its proper divisors (41444719).

206216345 is a wasteful number, since it uses less digits than its factorization.

206216345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33579.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 206216345 is about 14360.2348518400. The cubic root of 206216345 is about 590.8007369516.

Adding to 206216345 its reverse (543612602), we get a palindrome (749828947).

The spelling of 206216345 in words is "two hundred six million, two hundred sixteen thousand, three hundred forty-five".