205305166 has 16 divisors (see below), whose sum is σ = 336389040. Its totient is φ = 93199680.

The previous prime is 205305143. The next prime is 205305167. The reversal of 205305166 is 661503502.

It is a super-2 number, since 2×205305166² = 84300422372575112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205305167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12610 + ... + 23866.

It is an arithmetic number, because the mean of its divisors is an integer number (21024315).

Almost surely, 2^205305166 is an apocalyptic number.

205305166 is a deficient number, since it is larger than the sum of its proper divisors (131083874).

205305166 is a wasteful number, since it uses less digits than its factorization.

205305166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12099.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 205305166 is about 14328.4739592184. The cubic root of 205305166 is about 589.9292896203.

Adding to 205305166 its reverse (661503502), we get a palindrome (866808668).

It can be divided in two parts, 205 and 305166, that added together give a triangular number (305371 = T₇₈₁).

The spelling of 205305166 in words is "two hundred five million, three hundred five thousand, one hundred sixty-six".