216365823 has 10 divisors (see below), whose sum is σ = 323213264. Its totient is φ = 144243828.

The previous prime is 216365819. The next prime is 216365827. The reversal of 216365823 is 328563612.

It is a happy number.

216365823 is a `hidden beast` number, since 216 + 365 + 82 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (216365819) and next prime (216365827).

It is not a de Polignac number, because 216365823 - 2² = 216365819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216365827) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1335511 + ... + 1335672.

Almost surely, 2^216365823 is an apocalyptic number.

216365823 is a deficient number, since it is larger than the sum of its proper divisors (106847441).

216365823 is an equidigital number, since it uses as much as digits as its factorization.

216365823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671195 (or 2671186 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 216365823 is about 14709.3787428294. The cubic root of 216365823 is about 600.3385339553.

The spelling of 216365823 in words is "two hundred sixteen million, three hundred sixty-five thousand, eight hundred twenty-three".