216651650 has 24 divisors (see below), whose sum is σ = 413866740. Its totient is φ = 84317760.

The previous prime is 216651649. The next prime is 216651683. The reversal of 216651650 is 56156612.

It can be written as a sum of positive squares in 6 ways, for example, as 99341089 + 117310561 = 9967^2 + 10831^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56705 + ... + 60404.

Almost surely, 2^216651650 is an apocalyptic number.

216651650 is a deficient number, since it is larger than the sum of its proper divisors (197215090).

216651650 is a wasteful number, since it uses less digits than its factorization.

216651650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117158 (or 117153 counting only the distinct ones).

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

The square root of 216651650 is about 14719.0913442373. The cubic root of 216651650 is about 600.6027738663.

The spelling of 216651650 in words is "two hundred sixteen million, six hundred fifty-one thousand, six hundred fifty".