216600643 has 4 divisors (see below), whose sum is σ = 247543600. Its totient is φ = 185657688.

The previous prime is 216600641. The next prime is 216600647. The reversal of 216600643 is 346006612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216600643 - 2¹ = 216600641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216600641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15471468 + ... + 15471481.

It is an arithmetic number, because the mean of its divisors is an integer number (61885900).

Almost surely, 2^216600643 is an apocalyptic number.

216600643 is a deficient number, since it is larger than the sum of its proper divisors (30942957).

216600643 is an equidigital number, since it uses as much as digits as its factorization.

216600643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30942956.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 216600643 is about 14717.3585605570. The cubic root of 216600643 is about 600.5556362144. Note that the first 3 decimals are identical.

The spelling of 216600643 in words is "two hundred sixteen million, six hundred thousand, six hundred forty-three".