216613316 has 18 divisors (see below), whose sum is σ = 382547802. Its totient is φ = 107322880.

The previous prime is 216613307. The next prime is 216613349. The reversal of 216613316 is 613316612.

It is a happy number.

216613316 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1110916 + 215502400 = 1054^2 + 14680^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48956 + ... + 53196.

Almost surely, 2^216613316 is an apocalyptic number.

It is an amenable number.

216613316 is a deficient number, since it is larger than the sum of its proper divisors (165934486).

216613316 is a wasteful number, since it uses less digits than its factorization.

216613316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471 (or 4356 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 216613316 is about 14717.7891002691. The cubic root of 216613316 is about 600.5673485421.

Adding to 216613316 its reverse (613316612), we get a palindrome (829929928).

The spelling of 216613316 in words is "two hundred sixteen million, six hundred thirteen thousand, three hundred sixteen".