216608697 has 6 divisors (see below), whose sum is σ = 312879242. Its totient is φ = 144405792.

The previous prime is 216608681. The next prime is 216608719. The reversal of 216608697 is 796806612.

It can be written as a sum of positive squares in only one way, i.e., 216354681 + 254016 = 14709^2 + 504^2 .

It is not a de Polignac number, because 216608697 - 2⁴ = 216608681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216600697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12033808 + ... + 12033825.

Almost surely, 2^216608697 is an apocalyptic number.

It is an amenable number.

216608697 is a deficient number, since it is larger than the sum of its proper divisors (96270545).

216608697 is a wasteful number, since it uses less digits than its factorization.

216608697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24067639 (or 24067636 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 216608697 is about 14717.6321804834. The cubic root of 216608697 is about 600.5630797367.

The spelling of 216608697 in words is "two hundred sixteen million, six hundred eight thousand, six hundred ninety-seven".