206661056 has 28 divisors (see below), whose sum is σ = 468678768. Its totient is φ = 88568832.

The previous prime is 206660983. The next prime is 206661079. The reversal of 206661056 is 650166602.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 230201 + ... + 231096.

Almost surely, 2^206661056 is an apocalyptic number.

It is an amenable number.

206661056 is an abundant number, since it is smaller than the sum of its proper divisors (262017712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206661056 is an equidigital number, since it uses as much as digits as its factorization.

206661056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461316 (or 461306 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 206661056 is about 14375.7106259134. The cubic root of 206661056 is about 591.2251244997.

The spelling of 206661056 in words is "two hundred six million, six hundred sixty-one thousand, fifty-six".