206505116999 has 4 divisors (see below), whose sum is σ = 206507016336. Its totient is φ = 206503217664.

The previous prime is 206505116977. The next prime is 206505117001. The reversal of 206505116999 is 999611505602.

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 206505116999 - 2⁸ = 206505116743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206505116999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206505116969) 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, 775994 + ... + 1007559.

It is an arithmetic number, because the mean of its divisors is an integer number (51626754084).

Almost surely, 2^206505116999 is an apocalyptic number.

206505116999 is a deficient number, since it is larger than the sum of its proper divisors (1899337).

206505116999 is a wasteful number, since it uses less digits than its factorization.

206505116999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899336.

The product of its (nonzero) digits is 1312200, while the sum is 53.

The spelling of 206505116999 in words is "two hundred six billion, five hundred five million, one hundred sixteen thousand, nine hundred ninety-nine".