205564664 has 16 divisors (see below), whose sum is σ = 388249200. Its totient is φ = 102031552.

The previous prime is 205564661. The next prime is 205564703. The reversal of 205564664 is 466465502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205564661) 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, 92684 + ... + 94875.

It is an arithmetic number, because the mean of its divisors is an integer number (24265575).

Almost surely, 2^205564664 is an apocalyptic number.

It is an amenable number.

205564664 is a deficient number, since it is larger than the sum of its proper divisors (182684536).

205564664 is a wasteful number, since it uses less digits than its factorization.

205564664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187702 (or 187698 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The square root of 205564664 is about 14337.5264254334. The cubic root of 205564664 is about 590.1777344450.

The spelling of 205564664 in words is "two hundred five million, five hundred sixty-four thousand, six hundred sixty-four".