216553361 has 4 divisors (see below), whose sum is σ = 229291812. Its totient is φ = 203814912.

The previous prime is 216553357. The next prime is 216553417. The reversal of 216553361 is 163355612.

216553361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130416400 + 86136961 = 11420^2 + 9281^2 .

It is a cyclic number.

It is not a de Polignac number, because 216553361 - 2² = 216553357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216553061) 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, 6369200 + ... + 6369233.

It is an arithmetic number, because the mean of its divisors is an integer number (57322953).

Almost surely, 2^216553361 is an apocalyptic number.

It is an amenable number.

216553361 is a deficient number, since it is larger than the sum of its proper divisors (12738451).

216553361 is a wasteful number, since it uses less digits than its factorization.

216553361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12738450.

The product of its digits is 16200, while the sum is 32.

The square root of 216553361 is about 14715.7521384400. The cubic root of 216553361 is about 600.5119343774.

The spelling of 216553361 in words is "two hundred sixteen million, five hundred fifty-three thousand, three hundred sixty-one".