205042566 has 16 divisors (see below), whose sum is σ = 431668800. Its totient is φ = 64750248.

The previous prime is 205042553. The next prime is 205042571. The reversal of 205042566 is 665240502.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 899196 + ... + 899423.

It is an arithmetic number, because the mean of its divisors is an integer number (26979300).

Almost surely, 2^205042566 is an apocalyptic number.

205042566 is an abundant number, since it is smaller than the sum of its proper divisors (226626234).

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

205042566 is a wasteful number, since it uses less digits than its factorization.

205042566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798643.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 205042566 is about 14319.3074553206. The cubic root of 205042566 is about 589.6776617131.

The spelling of 205042566 in words is "two hundred five million, forty-two thousand, five hundred sixty-six".