205220166 has 16 divisors (see below), whose sum is σ = 419985984. Its totient is φ = 66815784.

The previous prime is 205220149. The next prime is 205220173. The reversal of 205220166 is 661022502.

205220166 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397456 + ... + 397971.

It is an arithmetic number, because the mean of its divisors is an integer number (26249124).

Almost surely, 2^205220166 is an apocalyptic number.

205220166 is an abundant number, since it is smaller than the sum of its proper divisors (214765818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205220166 is a wasteful number, since it uses less digits than its factorization.

205220166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795475.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 205220166 is about 14325.5075302762. The cubic root of 205220166 is about 589.8478646333.

Adding to 205220166 its reverse (661022502), we get a palindrome (866242668).

The spelling of 205220166 in words is "two hundred five million, two hundred twenty thousand, one hundred sixty-six".