206166239999 has 4 divisors (see below), whose sum is σ = 206359100040. Its totient is φ = 205973379960.

The previous prime is 206166239987. The next prime is 206166240019. The reversal of 206166239999 is 999932661602.

206166239999 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 a de Polignac number, because none of the positive numbers 2^k-206166239999 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 (206166239099) 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, 96428417 + ... + 96430554.

It is an arithmetic number, because the mean of its divisors is an integer number (51589775010).

Almost surely, 2^206166239999 is an apocalyptic number.

206166239999 is a deficient number, since it is larger than the sum of its proper divisors (192860041).

206166239999 is a wasteful number, since it uses less digits than its factorization.

206166239999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192860040.

The product of its (nonzero) digits is 17006112, while the sum is 62.

The spelling of 206166239999 in words is "two hundred six billion, one hundred sixty-six million, two hundred thirty-nine thousand, nine hundred ninety-nine".