204539869866 has 32 divisors (see below), whose sum is σ = 410426935488. Its totient is φ = 67955690880.

The previous prime is 204539869843. The next prime is 204539869903. The reversal of 204539869866 is 668968935402.

It is a junction number, because it is equal to n+sod(n) for n = 204539869797 and 204539869806.

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 15 ways as a sum of consecutive naturals, for example, 3114121 + ... + 3179123.

It is an arithmetic number, because the mean of its divisors is an integer number (12825841734).

Almost surely, 2^204539869866 is an apocalyptic number.

204539869866 is an abundant number, since it is smaller than the sum of its proper divisors (205887065622).

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

204539869866 is a wasteful number, since it uses less digits than its factorization.

204539869866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66726.

The product of its (nonzero) digits is 134369280, while the sum is 66.

The spelling of 204539869866 in words is "two hundred four billion, five hundred thirty-nine million, eight hundred sixty-nine thousand, eight hundred sixty-six".