216636650 has 12 divisors (see below), whose sum is σ = 402944262. Its totient is φ = 86654640.

The previous prime is 216636647. The next prime is 216636653. The reversal of 216636650 is 56636612.

It is an interprime number because it is at equal distance from previous prime (216636647) and next prime (216636653).

It can be written as a sum of positive squares in 3 ways, for example, as 104509729 + 112126921 = 10223^2 + 10589^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216636650.

It is not an unprimeable number, because it can be changed into a prime (216636653) 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, 2166317 + ... + 2166416.

Almost surely, 2^216636650 is an apocalyptic number.

216636650 is a deficient number, since it is larger than the sum of its proper divisors (186307612).

216636650 is a wasteful number, since it uses less digits than its factorization.

216636650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332745 (or 4332740 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 216636650 is about 14718.5817930941. The cubic root of 216636650 is about 600.5889125217.

The spelling of 216636650 in words is "two hundred sixteen million, six hundred thirty-six thousand, six hundred fifty".