216600061 has 2 divisors, whose sum is σ = 216600062. Its totient is φ = 216600060.

The previous prime is 216600047. The next prime is 216600091. The reversal of 216600061 is 160006612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205377561 + 11222500 = 14331^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 216600061 - 2¹⁹ = 216075773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216600001) 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 as a sum of consecutive naturals, namely, 108300030 + 108300031.

It is an arithmetic number, because the mean of its divisors is an integer number (108300031).

Almost surely, 2^216600061 is an apocalyptic number.

It is an amenable number.

216600061 is a deficient number, since it is larger than the sum of its proper divisors (1).

216600061 is an equidigital number, since it uses as much as digits as its factorization.

216600061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 216600061 is about 14717.3387879739. The cubic root of 216600061 is about 600.5550983218. Note that the first 3 decimals are identical.

Adding to 216600061 its reverse (160006612), we get a palindrome (376606673).

The spelling of 216600061 in words is "two hundred sixteen million, six hundred thousand, sixty-one".