206406663 has 8 divisors (see below), whose sum is σ = 275286000. Its totient is φ = 137565888.

The previous prime is 206406653. The next prime is 206406677. The reversal of 206406663 is 366604602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206406663 - 2¹⁴ = 206390279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206406643) 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, 6913 + ... + 21461.

It is an arithmetic number, because the mean of its divisors is an integer number (34410750).

Almost surely, 2^206406663 is an apocalyptic number.

206406663 is a deficient number, since it is larger than the sum of its proper divisors (68879337).

206406663 is a wasteful number, since it uses less digits than its factorization.

206406663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19281.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 206406663 is about 14366.8598865584. The cubic root of 206406663 is about 590.9824319605.

The spelling of 206406663 in words is "two hundred six million, four hundred six thousand, six hundred sixty-three".