216673559 has 4 divisors (see below), whose sum is σ = 216752616. Its totient is φ = 216594504.

The previous prime is 216673553. The next prime is 216673571. The reversal of 216673559 is 955376612.

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 216673559 - 2¹² = 216669463 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 (216673553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35264 + ... + 40949.

It is an arithmetic number, because the mean of its divisors is an integer number (54188154).

Almost surely, 2^216673559 is an apocalyptic number.

216673559 is a deficient number, since it is larger than the sum of its proper divisors (79057).

216673559 is an equidigital number, since it uses as much as digits as its factorization.

216673559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79056.

The product of its digits is 340200, while the sum is 44.

The square root of 216673559 is about 14719.8355629402. The cubic root of 216673559 is about 600.6230185965.

The spelling of 216673559 in words is "two hundred sixteen million, six hundred seventy-three thousand, five hundred fifty-nine".