206840909279 has 4 divisors (see below), whose sum is σ = 208469577984. Its totient is φ = 205212240576.

The previous prime is 206840909267. The next prime is 206840909281. The reversal of 206840909279 is 972909048602.

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-206840909279 is a prime.

It is a super-3 number, since 3×206840909279³ (a number of 35 digits) contains 333 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 (206840909239) 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, 814334162 + ... + 814334415.

It is an arithmetic number, because the mean of its divisors is an integer number (52117394496).

Almost surely, 2^206840909279 is an apocalyptic number.

206840909279 is a deficient number, since it is larger than the sum of its proper divisors (1628668705).

206840909279 is a wasteful number, since it uses less digits than its factorization.

206840909279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628668704.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 206840909279 in words is "two hundred six billion, eight hundred forty million, nine hundred nine thousand, two hundred seventy-nine".