216615650 has 12 divisors (see below), whose sum is σ = 402905202. Its totient is φ = 86646240.

The previous prime is 216615643. The next prime is 216615653. The reversal of 216615650 is 56516612.

216615650 is digitally balanced in base 2, 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 144552529 + 72063121 = 12023^2 + 8489^2 .

It is not an unprimeable number, because it can be changed into a prime (216615653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2166107 + ... + 2166206.

Almost surely, 2^216615650 is an apocalyptic number.

216615650 is a deficient number, since it is larger than the sum of its proper divisors (186289552).

216615650 is a wasteful number, since it uses less digits than its factorization.

216615650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332325 (or 4332320 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 216615650 is about 14717.8683918562. The cubic root of 216615650 is about 600.5695055643.

The spelling of 216615650 in words is "two hundred sixteen million, six hundred fifteen thousand, six hundred fifty".