206516505 has 16 divisors (see below), whose sum is σ = 355844160. Its totient is φ = 101669568.

The previous prime is 206516447. The next prime is 206516581. The reversal of 206516505 is 505615602.

It is not a de Polignac number, because 206516505 - 2⁶ = 206516441 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 529335 + ... + 529724.

It is an arithmetic number, because the mean of its divisors is an integer number (22240260).

Almost surely, 2^206516505 is an apocalyptic number.

It is an amenable number.

206516505 is a deficient number, since it is larger than the sum of its proper divisors (149327655).

206516505 is a wasteful number, since it uses less digits than its factorization.

206516505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059080.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 206516505 is about 14370.6821341229. The cubic root of 206516505 is about 591.0872463751.

The spelling of 206516505 in words is "two hundred six million, five hundred sixteen thousand, five hundred five".