216566039 has 2 divisors, whose sum is σ = 216566040. Its totient is φ = 216566038.

The previous prime is 216566023. The next prime is 216566041. The reversal of 216566039 is 930665612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216566039 - 2⁴ = 216566023 is a prime.

It is a Sophie Germain prime.

Together with 216566041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216565993 and 216566011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216566099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108283019 + 108283020.

It is an arithmetic number, because the mean of its divisors is an integer number (108283020).

Almost surely, 2^216566039 is an apocalyptic number.

216566039 is a deficient number, since it is larger than the sum of its proper divisors (1).

216566039 is an equidigital number, since it uses as much as digits as its factorization.

216566039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 216566039 is about 14716.1828950309. The cubic root of 216566039 is about 600.5236530314.

The spelling of 216566039 in words is "two hundred sixteen million, five hundred sixty-six thousand, thirty-nine".