216651236 has 6 divisors (see below), whose sum is σ = 379139670. Its totient is φ = 108325616.

The previous prime is 216651233. The next prime is 216651251. The reversal of 216651236 is 632156612.

It can be written as a sum of positive squares in only one way, i.e., 136656100 + 79995136 = 11690^2 + 8944^2 .

It is not an unprimeable number, because it can be changed into a prime (216651233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27081401 + ... + 27081408.

It is an arithmetic number, because the mean of its divisors is an integer number (63189945).

Almost surely, 2^216651236 is an apocalyptic number.

It is an amenable number.

216651236 is a deficient number, since it is larger than the sum of its proper divisors (162488434).

216651236 is a wasteful number, since it uses less digits than its factorization.

216651236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54162813 (or 54162811 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 216651236 is about 14719.0772808624. The cubic root of 216651236 is about 600.6023913018.

The spelling of 216651236 in words is "two hundred sixteen million, six hundred fifty-one thousand, two hundred thirty-six".