206664443 has 4 divisors (see below), whose sum is σ = 206694840. Its totient is φ = 206634048.

The previous prime is 206664431. The next prime is 206664449. The reversal of 206664443 is 344466602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 206664443 - 2¹⁰ = 206663419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206664449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203 + ... + 20331.

It is an arithmetic number, because the mean of its divisors is an integer number (51673710).

Almost surely, 2^206664443 is an apocalyptic number.

206664443 is a deficient number, since it is larger than the sum of its proper divisors (30397).

206664443 is a wasteful number, since it uses less digits than its factorization.

206664443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30396.

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 206664443 is about 14375.8284283028. The cubic root of 206664443 is about 591.2283543753.

The spelling of 206664443 in words is "two hundred six million, six hundred sixty-four thousand, four hundred forty-three".