205216553 has 4 divisors (see below), whose sum is σ = 205386948. Its totient is φ = 205046160.

The previous prime is 205216507. The next prime is 205216577. The reversal of 205216553 is 355612502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17197609 + 188018944 = 4147^2 + 13712^2 .

It is a cyclic number.

It is not a de Polignac number, because 205216553 - 2⁶ = 205216489 is a prime.

It is a super-2 number, since 2×205216553² = 84227667250403618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205213553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83378 + ... + 85803.

It is an arithmetic number, because the mean of its divisors is an integer number (51346737).

Almost surely, 2^205216553 is an apocalyptic number.

It is an amenable number.

205216553 is a deficient number, since it is larger than the sum of its proper divisors (170395).

205216553 is a wasteful number, since it uses less digits than its factorization.

205216553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170394.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 205216553 is about 14325.3814259865. The cubic root of 205216553 is about 589.8444030943.

The spelling of 205216553 in words is "two hundred five million, two hundred sixteen thousand, five hundred fifty-three".