216605983 has 8 divisors (see below), whose sum is σ = 236736000. Its totient is φ = 196549080.

The previous prime is 216605981. The next prime is 216605989. The reversal of 216605983 is 389506612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216605983 - 2¹ = 216605981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216605981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11983 + ... + 24016.

It is an arithmetic number, because the mean of its divisors is an integer number (29592000).

Almost surely, 2^216605983 is an apocalyptic number.

216605983 is a deficient number, since it is larger than the sum of its proper divisors (20130017).

216605983 is a wasteful number, since it uses less digits than its factorization.

216605983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36557.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 216605983 is about 14717.5399778631. The cubic root of 216605983 is about 600.5605714733.

The spelling of 216605983 in words is "two hundred sixteen million, six hundred five thousand, nine hundred eighty-three".