206510505650 has 12 divisors (see below), whose sum is σ = 384109540602. Its totient is φ = 82604202240.

The previous prime is 206510505637. The next prime is 206510505659. The reversal of 206510505650 is 56505015602.

206510505650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 183782832601 + 22727673049 = 428699^2 + 150757^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 206510505650.

It is not an unprimeable number, because it can be changed into a prime (206510505659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2065105007 + ... + 2065105106.

Almost surely, 2^206510505650 is an apocalyptic number.

206510505650 is a deficient number, since it is larger than the sum of its proper divisors (177599034952).

206510505650 is a wasteful number, since it uses less digits than its factorization.

206510505650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130210125 (or 4130210120 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 206510505650 in words is "two hundred six billion, five hundred ten million, five hundred five thousand, six hundred fifty".