205553785281 has 16 divisors (see below), whose sum is σ = 296389121280. Its totient is φ = 125965365120.

The previous prime is 205553785267. The next prime is 205553785337. The reversal of 205553785281 is 182587355502.

It is not a de Polignac number, because 205553785281 - 2⁵ = 205553785249 is a prime.

It is a super-2 number, since 2×205553785281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205553785201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11017060 + ... + 11035701.

It is an arithmetic number, because the mean of its divisors is an integer number (18524320080).

Almost surely, 2^205553785281 is an apocalyptic number.

It is an amenable number.

205553785281 is a deficient number, since it is larger than the sum of its proper divisors (90835335999).

205553785281 is a wasteful number, since it uses less digits than its factorization.

205553785281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22053016.

The product of its (nonzero) digits is 3360000, while the sum is 51.

The spelling of 205553785281 in words is "two hundred five billion, five hundred fifty-three million, seven hundred eighty-five thousand, two hundred eighty-one".