216241665 has 8 divisors (see below), whose sum is σ = 345986688. Its totient is φ = 115328880.

The previous prime is 216241657. The next prime is 216241673. The reversal of 216241665 is 566142612.

It is an interprime number because it is at equal distance from previous prime (216241657) and next prime (216241673).

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

It is not a de Polignac number, because 216241665 - 2³ = 216241657 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, 7208041 + ... + 7208070.

It is an arithmetic number, because the mean of its divisors is an integer number (43248336).

Almost surely, 2^216241665 is an apocalyptic number.

It is an amenable number.

216241665 is a deficient number, since it is larger than the sum of its proper divisors (129745023).

216241665 is a wasteful number, since it uses less digits than its factorization.

216241665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14416119.

The product of its digits is 17280, while the sum is 33.

The square root of 216241665 is about 14705.1577686198. The cubic root of 216241665 is about 600.2236804903.

The spelling of 216241665 in words is "two hundred sixteen million, two hundred forty-one thousand, six hundred sixty-five".