205550066 has 8 divisors (see below), whose sum is σ = 309439020. Its totient is φ = 102403728.

The previous prime is 205550029. The next prime is 205550069. The reversal of 205550066 is 660055502.

It can be written as a sum of positive squares in 2 ways, for example, as 176119441 + 29430625 = 13271^2 + 5425^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205550069) 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, 184961 + ... + 186068.

Almost surely, 2^205550066 is an apocalyptic number.

205550066 is a deficient number, since it is larger than the sum of its proper divisors (103888954).

205550066 is a wasteful number, since it uses less digits than its factorization.

205550066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371308.

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

The square root of 205550066 is about 14337.0173327649. The cubic root of 205550066 is about 590.1637637908.

The spelling of 205550066 in words is "two hundred five million, five hundred fifty thousand, sixty-six".