206505565 has 24 divisors (see below), whose sum is σ = 290037888. Its totient is φ = 138267360.

The previous prime is 206505553. The next prime is 206505583. The reversal of 206505565 is 565505602.

It is a happy number.

206505565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-206505565 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206505565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63120 + ... + 66310.

It is an arithmetic number, because the mean of its divisors is an integer number (12084912).

Almost surely, 2^206505565 is an apocalyptic number.

It is an amenable number.

206505565 is a deficient number, since it is larger than the sum of its proper divisors (83532323).

206505565 is an equidigital number, since it uses as much as digits as its factorization.

206505565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289 (or 3246 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 34.

The square root of 206505565 is about 14370.3014930098. The cubic root of 206505565 is about 591.0768087772.

The spelling of 206505565 in words is "two hundred six million, five hundred five thousand, five hundred sixty-five".