216580061 has 2 divisors, whose sum is σ = 216580062. Its totient is φ = 216580060.

The previous prime is 216580003. The next prime is 216580079. The reversal of 216580061 is 160085612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195832036 + 20748025 = 13994^2 + 4555^2 .

It is a cyclic number.

It is not a de Polignac number, because 216580061 - 2¹⁰ = 216579037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216580361) 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 as a sum of consecutive naturals, namely, 108290030 + 108290031.

It is an arithmetic number, because the mean of its divisors is an integer number (108290031).

Almost surely, 2^216580061 is an apocalyptic number.

It is an amenable number.

216580061 is a deficient number, since it is larger than the sum of its proper divisors (1).

216580061 is an equidigital number, since it uses as much as digits as its factorization.

216580061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 216580061 is about 14716.6593016214. The cubic root of 216580061 is about 600.5366134521.

The spelling of 216580061 in words is "two hundred sixteen million, five hundred eighty thousand, sixty-one".