206640424653 has 16 divisors (see below), whose sum is σ = 303614794560. Its totient is φ = 124206050304.

The previous prime is 206640424651. The next prime is 206640424673. The reversal of 206640424653 is 356424046602.

206640424653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206640424653 - 2¹ = 206640424651 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206640424651) 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 15 ways as a sum of consecutive naturals, for example, 61608468 + ... + 61611821.

It is an arithmetic number, because the mean of its divisors is an integer number (18975924660).

Almost surely, 2^206640424653 is an apocalyptic number.

It is an amenable number.

206640424653 is a deficient number, since it is larger than the sum of its proper divisors (96974369907).

206640424653 is a wasteful number, since it uses less digits than its factorization.

206640424653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123220348.

The product of its (nonzero) digits is 829440, while the sum is 42.

The spelling of 206640424653 in words is "two hundred six billion, six hundred forty million, four hundred twenty-four thousand, six hundred fifty-three".