205663345 has 8 divisors (see below), whose sum is σ = 246919680. Its totient is φ = 164448240.

The previous prime is 205663333. The next prime is 205663361. The reversal of 205663345 is 543366502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205663345 - 2¹¹ = 205661297 is a prime.

It is a super-2 number, since 2×205663345² = 84594822953178050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205663345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2010 + ... + 20380.

It is an arithmetic number, because the mean of its divisors is an integer number (30864960).

Almost surely, 2^205663345 is an apocalyptic number.

It is an amenable number.

205663345 is a deficient number, since it is larger than the sum of its proper divisors (41256335).

205663345 is a wasteful number, since it uses less digits than its factorization.

205663345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20615.

The product of its (nonzero) digits is 64800, while the sum is 34.

The square root of 205663345 is about 14340.9673662553. The cubic root of 205663345 is about 590.2721573079.

The spelling of 205663345 in words is "two hundred five million, six hundred sixty-three thousand, three hundred forty-five".