206643949954 has 36 divisors (see below), whose sum is σ = 354238996626. Its totient is φ = 90354386304.

The previous prime is 206643949909. The next prime is 206643949979. The reversal of 206643949954 is 459949346602.

206643949954 is digitally balanced in base 3, 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 42631099729 + 164012850225 = 206473^2 + 404985^2 .

It is a junction number, because it is equal to n+sod(n) for n = 206643949892 and 206643949901.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 724759 + ... + 968794.

Almost surely, 2^206643949954 is an apocalyptic number.

206643949954 is a deficient number, since it is larger than the sum of its proper divisors (147595046672).

206643949954 is a wasteful number, since it uses less digits than its factorization.

206643949954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693619 (or 1693587 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 61.

The spelling of 206643949954 in words is "two hundred six billion, six hundred forty-three million, nine hundred forty-nine thousand, nine hundred fifty-four".