206785900109 has 8 divisors (see below), whose sum is σ = 219047431680. Its totient is φ = 194535219136.

The previous prime is 206785900067. The next prime is 206785900169. The reversal of 206785900109 is 901009587602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206785900109 - 2²⁴ = 206769122893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206785900169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2673389 + ... + 2749650.

It is an arithmetic number, because the mean of its divisors is an integer number (27380928960).

Almost surely, 2^206785900109 is an apocalyptic number.

It is an amenable number.

206785900109 is a deficient number, since it is larger than the sum of its proper divisors (12261531571).

206785900109 is a wasteful number, since it uses less digits than its factorization.

206785900109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425299.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 206785900109 in words is "two hundred six billion, seven hundred eighty-five million, nine hundred thousand, one hundred nine".