205681258830 has 64 divisors (see below), whose sum is σ = 495968997888. Its totient is φ = 54589541760.

The previous prime is 205681258823. The next prime is 205681258841. The reversal of 205681258830 is 38852186502.

It is a self number, because there is not a number n which added to its sum of digits gives 205681258830.

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 31 ways as a sum of consecutive naturals, for example, 6300129 + ... + 6332691.

It is an arithmetic number, because the mean of its divisors is an integer number (7749515592).

Almost surely, 2^205681258830 is an apocalyptic number.

205681258830 is an abundant number, since it is smaller than the sum of its proper divisors (290287739058).

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

205681258830 is a wasteful number, since it uses less digits than its factorization.

205681258830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33561.

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 205681258830 in words is "two hundred five billion, six hundred eighty-one million, two hundred fifty-eight thousand, eight hundred thirty".