206646646 has 4 divisors (see below), whose sum is σ = 309969972. Its totient is φ = 103323322.

The previous prime is 206646631. The next prime is 206646647. The reversal of 206646646 is 646646602.

206646646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 206646599 and 206646608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206646647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51661660 + ... + 51661663.

It is an arithmetic number, because the mean of its divisors is an integer number (77492493).

Almost surely, 2^206646646 is an apocalyptic number.

206646646 is a deficient number, since it is larger than the sum of its proper divisors (103323326).

206646646 is a wasteful number, since it uses less digits than its factorization.

206646646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103323325.

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 206646646 is about 14375.2094245614. The cubic root of 206646646 is about 591.2113825910.

The spelling of 206646646 in words is "two hundred six million, six hundred forty-six thousand, six hundred forty-six".