216943553 has 8 divisors (see below), whose sum is σ = 221486400. Its totient is φ = 212442160.

The previous prime is 216943541. The next prime is 216943589. The reversal of 216943553 is 355349612.

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 216943553 - 2⁴ = 216943537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216943453) 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, 326 + ... + 20832.

It is an arithmetic number, because the mean of its divisors is an integer number (27685800).

Almost surely, 2^216943553 is an apocalyptic number.

It is an amenable number.

216943553 is a deficient number, since it is larger than the sum of its proper divisors (4542847).

216943553 is a wasteful number, since it uses less digits than its factorization.

216943553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20727.

The product of its digits is 97200, while the sum is 38.

The square root of 216943553 is about 14729.0038020227. The cubic root of 216943553 is about 600.8723911266.

The spelling of 216943553 in words is "two hundred sixteen million, nine hundred forty-three thousand, five hundred fifty-three".