205400874918 has 16 divisors (see below), whose sum is σ = 418552726896. Its totient is φ = 67175128800.

The previous prime is 205400874901. The next prime is 205400874923. The reversal of 205400874918 is 819478004502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322957033 + ... + 322957668.

It is an arithmetic number, because the mean of its divisors is an integer number (26159545431).

Almost surely, 2^205400874918 is an apocalyptic number.

205400874918 is an abundant number, since it is smaller than the sum of its proper divisors (213151851978).

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

205400874918 is a wasteful number, since it uses less digits than its factorization.

205400874918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645914759.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 205400874918 in words is "two hundred five billion, four hundred million, eight hundred seventy-four thousand, nine hundred eighteen".