216465566913 has 16 divisors (see below), whose sum is σ = 331034560000. Its totient is φ = 139655203920.

The previous prime is 216465566857. The next prime is 216465566921. The reversal of 216465566913 is 319665564612.

216465566913 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 65 + 566 + 9 + 13 = 666.

It is not a de Polignac number, because 216465566913 - 2⁸ = 216465566657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216465566913.

It is not an unprimeable number, because it can be changed into a prime (216465566113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129309538 + ... + 129311211.

It is an arithmetic number, because the mean of its divisors is an integer number (20689660000).

Almost surely, 2^216465566913 is an apocalyptic number.

It is an amenable number.

216465566913 is a deficient number, since it is larger than the sum of its proper divisors (114568993087).

216465566913 is a wasteful number, since it uses less digits than its factorization.

216465566913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258620789 (or 258620783 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The spelling of 216465566913 in words is "two hundred sixteen billion, four hundred sixty-five million, five hundred sixty-six thousand, nine hundred thirteen".