216424665 has 24 divisors (see below), whose sum is σ = 376541568. Its totient is φ = 114994080.

The previous prime is 216424643. The next prime is 216424667. The reversal of 216424665 is 566424612.

216424665 is a `hidden beast` number, since 2 + 1 + 642 + 4 + 6 + 6 + 5 = 666.

216424665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216424665 - 2⁶ = 216424601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216424667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3322 + ... + 21068.

It is an arithmetic number, because the mean of its divisors is an integer number (15689232).

Almost surely, 2^216424665 is an apocalyptic number.

It is an amenable number.

216424665 is a deficient number, since it is larger than the sum of its proper divisors (160116903).

216424665 is a wasteful number, since it uses less digits than its factorization.

216424665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18029 (or 18026 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 216424665 is about 14711.3787593142. The cubic root of 216424665 is about 600.3929509264.

The spelling of 216424665 in words is "two hundred sixteen million, four hundred twenty-four thousand, six hundred sixty-five".