205863728988164 has 24 divisors (see below), whose sum is σ = 390543314712768. Its totient is φ = 94384796781600.

The previous prime is 205863728988091. The next prime is 205863728988241. The reversal of 205863728988164 is 461889827368502.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13108991702 + ... + 13109007405.

It is an arithmetic number, because the mean of its divisors is an integer number (16272638113032).

It is a 1-persistent number, because it is pandigital, but 2⋅205863728988164 = 411727457976328 is not.

Almost surely, 2^{205863728988164} is an apocalyptic number.

It is an amenable number.

205863728988164 is a deficient number, since it is larger than the sum of its proper divisors (184679585724604).

205863728988164 is a wasteful number, since it uses less digits than its factorization.

205863728988164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26217999275 (or 26217999273 counting only the distinct ones).

The product of its (nonzero) digits is 2229534720, while the sum is 77.

The spelling of 205863728988164 in words is "two hundred five trillion, eight hundred sixty-three billion, seven hundred twenty-eight million, nine hundred eighty-eight thousand, one hundred sixty-four".