206216644 has 6 divisors (see below), whose sum is σ = 360879134. Its totient is φ = 103108320.

The previous prime is 206216629. The next prime is 206216653. The reversal of 206216644 is 446612602.

It can be written as a sum of positive squares in only one way, i.e., 172134400 + 34082244 = 13120^2 + 5838^2 .

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 as a sum of consecutive naturals, namely, 25777077 + ... + 25777084.

Almost surely, 2^206216644 is an apocalyptic number.

It is an amenable number.

206216644 is a deficient number, since it is larger than the sum of its proper divisors (154662490).

206216644 is a wasteful number, since it uses less digits than its factorization.

206216644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51554165 (or 51554163 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 206216644 is about 14360.2452625295. The cubic root of 206216644 is about 590.8010224921.

The spelling of 206216644 in words is "two hundred six million, two hundred sixteen thousand, six hundred forty-four".