216560545 has 16 divisors (see below), whose sum is σ = 271233360. Its totient is φ = 165781504.

The previous prime is 216560543. The next prime is 216560573. The reversal of 216560545 is 545065612.

216560545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 38044224 + 178516321 = 6168^2 + 13361^2 .

It is a cyclic number.

It is not a de Polignac number, because 216560545 - 2¹ = 216560543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216560545.

It is not an unprimeable number, because it can be changed into a prime (216560543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9777 + ... + 22993.

It is an arithmetic number, because the mean of its divisors is an integer number (16952085).

Almost surely, 2^216560545 is an apocalyptic number.

It is an amenable number.

216560545 is a deficient number, since it is larger than the sum of its proper divisors (54672815).

216560545 is a wasteful number, since it uses less digits than its factorization.

216560545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13364.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 216560545 is about 14715.9962285942. The cubic root of 216560545 is about 600.5185748193.

The spelling of 216560545 in words is "two hundred sixteen million, five hundred sixty thousand, five hundred forty-five".