216460665 has 24 divisors (see below), whose sum is σ = 376429248. Its totient is φ = 115067040.

The previous prime is 216460663. The next prime is 216460681. The reversal of 216460665 is 566064612.

It is a happy number.

216460665 is a `hidden beast` number, since 2 + 1 + 646 + 0 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 216460665 - 2¹ = 216460663 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (216460661) 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, 6262 + ... + 21728.

It is an arithmetic number, because the mean of its divisors is an integer number (15684552).

Almost surely, 2^216460665 is an apocalyptic number.

It is an amenable number.

216460665 is a deficient number, since it is larger than the sum of its proper divisors (159968583).

216460665 is a wasteful number, since it uses less digits than its factorization.

216460665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15789 (or 15786 counting only the distinct ones).

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

The square root of 216460665 is about 14712.6022511315. The cubic root of 216460665 is about 600.4262387958.

The spelling of 216460665 in words is "two hundred sixteen million, four hundred sixty thousand, six hundred sixty-five".