216651065 has 8 divisors (see below), whose sum is σ = 260061000. Its totient is φ = 173267712.

The previous prime is 216651049. The next prime is 216651103. The reversal of 216651065 is 560156612.

It can be written as a sum of positive squares in 4 ways, for example, as 355216 + 216295849 = 596^2 + 14707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216651065 - 2⁴ = 216651049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24977 + ... + 32513.

It is an arithmetic number, because the mean of its divisors is an integer number (32507625).

Almost surely, 2^216651065 is an apocalyptic number.

It is an amenable number.

216651065 is a deficient number, since it is larger than the sum of its proper divisors (43409935).

216651065 is an equidigital number, since it uses as much as digits as its factorization.

216651065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13291.

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

The square root of 216651065 is about 14719.0714720732. The cubic root of 216651065 is about 600.6022332858.

The spelling of 216651065 in words is "two hundred sixteen million, six hundred fifty-one thousand, sixty-five".