205994028239 has 4 divisors (see below), whose sum is σ = 206155340424. Its totient is φ = 205832716056.

The previous prime is 205994028223. The next prime is 205994028257. The reversal of 205994028239 is 932820499502.

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 205994028239 - 2⁴ = 205994028223 is a prime.

It is a super-2 number, since 2×205994028239² (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 (205994028839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80654177 + ... + 80656730.

It is an arithmetic number, because the mean of its divisors is an integer number (51538835106).

Almost surely, 2^205994028239 is an apocalyptic number.

205994028239 is a deficient number, since it is larger than the sum of its proper divisors (161312185).

205994028239 is a wasteful number, since it uses less digits than its factorization.

205994028239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161312184.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 205994028239 in words is "two hundred five billion, nine hundred ninety-four million, twenty-eight thousand, two hundred thirty-nine".