206305155618 has 32 divisors (see below), whose sum is σ = 420468895296. Its totient is φ = 67459075008.

The previous prime is 206305155611. The next prime is 206305155643. The reversal of 206305155618 is 816551503602.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 206305155618.

It is not an unprimeable number, because it can be changed into a prime (206305155611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1867996 + ... + 1975352.

It is an arithmetic number, because the mean of its divisors is an integer number (13139652978).

Almost surely, 2^206305155618 is an apocalyptic number.

206305155618 is an abundant number, since it is smaller than the sum of its proper divisors (214163739678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206305155618 is a wasteful number, since it uses less digits than its factorization.

206305155618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113458.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 206305155618 in words is "two hundred six billion, three hundred five million, one hundred fifty-five thousand, six hundred eighteen".