205450664 has 8 divisors (see below), whose sum is σ = 385220010. Its totient is φ = 102725328.

The previous prime is 205450657. The next prime is 205450669. The reversal of 205450664 is 466054502.

It can be written as a sum of positive squares in only one way, i.e., 115390564 + 90060100 = 10742^2 + 9490^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 205450664.

It is not an unprimeable number, because it can be changed into a prime (205450669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12840659 + ... + 12840674.

Almost surely, 2^205450664 is an apocalyptic number.

It is an amenable number.

205450664 is a deficient number, since it is larger than the sum of its proper divisors (179769346).

205450664 is a wasteful number, since it uses less digits than its factorization.

205450664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25681339 (or 25681335 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 205450664 is about 14333.5502929316. The cubic root of 205450664 is about 590.0686159784.

The spelling of 205450664 in words is "two hundred five million, four hundred fifty thousand, six hundred sixty-four".