206353942247 has 4 divisors (see below), whose sum is σ = 218492409456. Its totient is φ = 194215475040.

The previous prime is 206353942243. The next prime is 206353942279. The reversal of 206353942247 is 742249353602.

206353942247 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 cyclic number.

It is not a de Polignac number, because 206353942247 - 2² = 206353942243 is a prime.

It is a super-2 number, since 2×206353942247² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206353942241) 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 3 ways as a sum of consecutive naturals, for example, 6069233579 + ... + 6069233612.

It is an arithmetic number, because the mean of its divisors is an integer number (54623102364).

Almost surely, 2^206353942247 is an apocalyptic number.

206353942247 is a deficient number, since it is larger than the sum of its proper divisors (12138467209).

206353942247 is a wasteful number, since it uses less digits than its factorization.

206353942247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12138467208.

The product of its (nonzero) digits is 2177280, while the sum is 47.

The spelling of 206353942247 in words is "two hundred six billion, three hundred fifty-three million, nine hundred forty-two thousand, two hundred forty-seven".