216594367609 has 9 divisors (see below), whose sum is σ = 217396407501. Its totient is φ = 215795280960.

The previous prime is 216594367579. The next prime is 216594367667. The reversal of 216594367609 is 906763495612.

The square root of 216594367609 is 465397.

It is a perfect power (a square), and thus also a powerful number.

216594367609 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 4 ways, for example, as 17117797225 + 199476570384 = 130835^2 + 446628^2 .

It is not a de Polignac number, because 216594367609 - 2⁷ = 216594367481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216594367109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 156838099 + ... + 156839479.

It is an arithmetic number, because the mean of its divisors is an integer number (24155156389).

Almost surely, 2^216594367609 is an apocalyptic number.

216594367609 is the 465397-th square number.

216594367609 is the 232699-th centered octagonal number.

It is an amenable number.

216594367609 is a deficient number, since it is larger than the sum of its proper divisors (802039892).

216594367609 is an frugal number, since it uses more digits than its factorization.

216594367609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 58.

The spelling of 216594367609 in words is "two hundred sixteen billion, five hundred ninety-four million, three hundred sixty-seven thousand, six hundred nine".