216332544645 has 24 divisors (see below), whose sum is σ = 428544470016. Its totient is φ = 98894877408.

The previous prime is 216332544529. The next prime is 216332544671. The reversal of 216332544645 is 546445233612.

216332544645 is a `hidden beast` number, since 2 + 1 + 63 + 3 + 2 + 544 + 6 + 45 = 666.

216332544645 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 216332544645 - 2¹⁰ = 216332543621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216332544645.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 343384677 + ... + 343385306.

It is an arithmetic number, because the mean of its divisors is an integer number (17856019584).

Almost surely, 2^216332544645 is an apocalyptic number.

It is an amenable number.

216332544645 is a deficient number, since it is larger than the sum of its proper divisors (212211925371).

216332544645 is a wasteful number, since it uses less digits than its factorization.

216332544645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686770001 (or 686769998 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 45.

The spelling of 216332544645 in words is "two hundred sixteen billion, three hundred thirty-two million, five hundred forty-four thousand, six hundred forty-five".