205849831836 has 96 divisors (see below), whose sum is σ = 541080723456. Its totient is φ = 60344568000.

The previous prime is 205849831819. The next prime is 205849831843. The reversal of 205849831836 is 638138948502.

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, 13786671 + ... + 13801593.

It is an arithmetic number, because the mean of its divisors is an integer number (5636257536).

Almost surely, 2^205849831836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205849831836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270540361728).

205849831836 is an abundant number, since it is smaller than the sum of its proper divisors (335230891620).

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

205849831836 is a wasteful number, since it uses less digits than its factorization.

205849831836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18343 (or 18341 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 57.

It can be divided in two parts, 2058 and 49831836, that added together give a palindrome (49833894).

The spelling of 205849831836 in words is "two hundred five billion, eight hundred forty-nine million, eight hundred thirty-one thousand, eight hundred thirty-six".