206338655639 has 4 divisors (see below), whose sum is σ = 206370149856. Its totient is φ = 206307161424.

The previous prime is 206338655623. The next prime is 206338655659. The reversal of 206338655639 is 936556833602.

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 206338655639 - 2⁴ = 206338655623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206338655659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15737279 + ... + 15750384.

It is an arithmetic number, because the mean of its divisors is an integer number (51592537464).

Almost surely, 2^206338655639 is an apocalyptic number.

206338655639 is a deficient number, since it is larger than the sum of its proper divisors (31494217).

206338655639 is an equidigital number, since it uses as much as digits as its factorization.

206338655639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31494216.

The product of its (nonzero) digits is 20995200, while the sum is 56.

The spelling of 206338655639 in words is "two hundred six billion, three hundred thirty-eight million, six hundred fifty-five thousand, six hundred thirty-nine".