205188885018 has 32 divisors (see below), whose sum is σ = 491050324800. Its totient is φ = 63135041328.

The previous prime is 205188885001. The next prime is 205188885047. The reversal of 205188885018 is 810588881502.

It is a happy number.

205188885018 is a `hidden beast` number, since 2 + 0 + 51 + 8 + 8 + 88 + 501 + 8 = 666.

205188885018 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146145228 + ... + 146146631.

It is an arithmetic number, because the mean of its divisors is an integer number (15345322650).

Almost surely, 2^205188885018 is an apocalyptic number.

205188885018 is an abundant number, since it is smaller than the sum of its proper divisors (285861439782).

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

205188885018 is a wasteful number, since it uses less digits than its factorization.

205188885018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292291883 (or 292291877 counting only the distinct ones).

The product of its (nonzero) digits is 1638400, while the sum is 54.

The spelling of 205188885018 in words is "two hundred five billion, one hundred eighty-eight million, eight hundred eighty-five thousand, eighteen".