205521982140 has 48 divisors (see below), whose sum is σ = 588844384128. Its totient is φ = 53531306304.

The previous prime is 205521982123. The next prime is 205521982147. The reversal of 205521982140 is 41289125502.

205521982140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205521982147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39827262 + ... + 39832421.

It is an arithmetic number, because the mean of its divisors is an integer number (12267591336).

Almost surely, 2^205521982140 is an apocalyptic number.

205521982140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205521982140 is an abundant number, since it is smaller than the sum of its proper divisors (383322401988).

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

205521982140 is a wasteful number, since it uses less digits than its factorization.

205521982140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79659738 (or 79659736 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 205521982140 in words is "two hundred five billion, five hundred twenty-one million, nine hundred eighty-two thousand, one hundred forty".