206138934999 has 6 divisors (see below), whose sum is σ = 297756239456. Its totient is φ = 137425956660.

The previous prime is 206138934997. The next prime is 206138935043. The reversal of 206138934999 is 999439831602.

206138934999 is a `hidden beast` number, since 2 + 0 + 6 + 138 + 9 + 3 + 499 + 9 = 666.

It is not a de Polignac number, because 206138934999 - 2¹ = 206138934997 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 (206138934997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11452163047 + ... + 11452163064.

Almost surely, 2^206138934999 is an apocalyptic number.

206138934999 is a deficient number, since it is larger than the sum of its proper divisors (91617304457).

206138934999 is a wasteful number, since it uses less digits than its factorization.

206138934999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22904326117 (or 22904326114 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 63.

The spelling of 206138934999 in words is "two hundred six billion, one hundred thirty-eight million, nine hundred thirty-four thousand, nine hundred ninety-nine".