216045505 has 16 divisors (see below), whose sum is σ = 288827280. Its totient is φ = 154038528.

The previous prime is 216045499. The next prime is 216045517. The reversal of 216045505 is 505540612.

It can be written as a sum of positive squares in 8 ways, for example, as 22724289 + 193321216 = 4767^2 + 13904^2 .

It is a cyclic number.

It is not a de Polignac number, because 216045505 - 2³ = 216045497 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, 55422 + ... + 59191.

It is an arithmetic number, because the mean of its divisors is an integer number (18051705).

Almost surely, 2^216045505 is an apocalyptic number.

It is an amenable number.

216045505 is a deficient number, since it is larger than the sum of its proper divisors (72781775).

216045505 is a wasteful number, since it uses less digits than its factorization.

216045505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114660.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 216045505 is about 14698.4864867101. The cubic root of 216045505 is about 600.0421313008.

The spelling of 216045505 in words is "two hundred sixteen million, forty-five thousand, five hundred five".