205384121956 has 12 divisors (see below), whose sum is σ = 387070076092. Its totient is φ = 94792671648.

The previous prime is 205384121953. The next prime is 205384121983. The reversal of 205384121956 is 659121483502.

205384121956 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 126439981056 + 78944140900 = 355584^2 + 280970^2 .

It is not an unprimeable number, because it can be changed into a prime (205384121953) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1974847275 + ... + 1974847378.

Almost surely, 2^205384121956 is an apocalyptic number.

205384121956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

205384121956 is a deficient number, since it is larger than the sum of its proper divisors (181685954136).

205384121956 is a wasteful number, since it uses less digits than its factorization.

205384121956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3949694670 (or 3949694668 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 205384121956 in words is "two hundred five billion, three hundred eighty-four million, one hundred twenty-one thousand, nine hundred fifty-six".