216665365 has 8 divisors (see below), whose sum is σ = 297141120. Its totient is φ = 148570512.

The previous prime is 216665353. The next prime is 216665369. The reversal of 216665365 is 563566612.

It is a happy number.

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 216665365 - 2⁵ = 216665333 is a prime.

It is a super-3 number, since 3×216665365³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216665369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3095185 + ... + 3095254.

It is an arithmetic number, because the mean of its divisors is an integer number (37142640).

Almost surely, 2^216665365 is an apocalyptic number.

It is an amenable number.

216665365 is a deficient number, since it is larger than the sum of its proper divisors (80475755).

216665365 is an equidigital number, since it uses as much as digits as its factorization.

216665365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190451.

The product of its digits is 194400, while the sum is 40.

The square root of 216665365 is about 14719.5572283952. The cubic root of 216665365 is about 600.6154471958.

The spelling of 216665365 in words is "two hundred sixteen million, six hundred sixty-five thousand, three hundred sixty-five".