216616553 has 8 divisors (see below), whose sum is σ = 229867200. Its totient is φ = 203685328.

The previous prime is 216616541. The next prime is 216616559. The reversal of 216616553 is 355616612.

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 216616553 - 2⁸ = 216616297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216616559) 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, 78458 + ... + 81171.

It is an arithmetic number, because the mean of its divisors is an integer number (28733400).

Almost surely, 2^216616553 is an apocalyptic number.

216616553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

216616553 is a deficient number, since it is larger than the sum of its proper divisors (13250647).

216616553 is a wasteful number, since it uses less digits than its factorization.

216616553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159711.

The product of its digits is 32400, while the sum is 35.

The square root of 216616553 is about 14717.8990688209. The cubic root of 216616553 is about 600.5703400893.

The spelling of 216616553 in words is "two hundred sixteen million, six hundred sixteen thousand, five hundred fifty-three".