216608553 has 32 divisors (see below), whose sum is σ = 370206720. Its totient is φ = 122608080.

The previous prime is 216608551. The next prime is 216608603. The reversal of 216608553 is 355806612.

It is not a de Polignac number, because 216608553 - 2¹ = 216608551 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216608551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14868 + ... + 25578.

It is an arithmetic number, because the mean of its divisors is an integer number (11568960).

Almost surely, 2^216608553 is an apocalyptic number.

It is an amenable number.

216608553 is a deficient number, since it is larger than the sum of its proper divisors (153598167).

216608553 is a wasteful number, since it uses less digits than its factorization.

216608553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10834 (or 10828 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 216608553 is about 14717.6272883913. The cubic root of 216608553 is about 600.5629466533.

The spelling of 216608553 in words is "two hundred sixteen million, six hundred eight thousand, five hundred fifty-three".