206830993857 has 32 divisors (see below), whose sum is σ = 285027724800. Its totient is φ = 133310815488.

The previous prime is 206830993823. The next prime is 206830993871. The reversal of 206830993857 is 758399038602.

It is not a de Polignac number, because 206830993857 - 2¹⁶ = 206830928321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206830993857.

It is not an unprimeable number, because it can be changed into a prime (206830993807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11606248 + ... + 11624054.

It is an arithmetic number, because the mean of its divisors is an integer number (8907116400).

Almost surely, 2^206830993857 is an apocalyptic number.

It is an amenable number.

206830993857 is a deficient number, since it is larger than the sum of its proper divisors (78196730943).

206830993857 is a wasteful number, since it uses less digits than its factorization.

206830993857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18505.

The product of its (nonzero) digits is 19595520, while the sum is 60.

The spelling of 206830993857 in words is "two hundred six billion, eight hundred thirty million, nine hundred ninety-three thousand, eight hundred fifty-seven".