216668984545 has 16 divisors (see below), whose sum is σ = 296473761360. Its totient is φ = 150589845504.

The previous prime is 216668984527. The next prime is 216668984549. The reversal of 216668984545 is 545489866612.

It is a happy number.

216668984545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 21820016656 + 194848967889 = 147716^2 + 441417^2 .

It is a cyclic number.

It is not a de Polignac number, because 216668984545 - 2²⁹ = 216132113633 is a prime.

It is a super-2 number, since 2×216668984545² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216668984549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98039160 + ... + 98041369.

It is an arithmetic number, because the mean of its divisors is an integer number (18529610085).

Almost surely, 2^216668984545 is an apocalyptic number.

It is an amenable number.

216668984545 is a deficient number, since it is larger than the sum of its proper divisors (79804776815).

216668984545 is a wasteful number, since it uses less digits than its factorization.

216668984545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196080564.

The product of its digits is 99532800, while the sum is 64.

The spelling of 216668984545 in words is "two hundred sixteen billion, six hundred sixty-eight million, nine hundred eighty-four thousand, five hundred forty-five".