216563432672945 has 8 divisors (see below), whose sum is σ = 259880113820736. Its totient is φ = 173248083062896.

The previous prime is 216563432672921. The next prime is 216563432672947. The reversal of 216563432672945 is 549276234365612.

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

It is a cyclic number.

It is not a de Polignac number, because 216563432672945 - 2¹⁶ = 216563432607409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216563432672947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332526587 + ... + 333177216.

It is an arithmetic number, because the mean of its divisors is an integer number (32485014227592).

Almost surely, 2^{216563432672945} is an apocalyptic number.

It is an amenable number.

216563432672945 is a deficient number, since it is larger than the sum of its proper divisors (43316681147791).

216563432672945 is an equidigital number, since it uses as much as digits as its factorization.

216563432672945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665768871.

The product of its digits is 391910400, while the sum is 65.

The spelling of 216563432672945 in words is "two hundred sixteen trillion, five hundred sixty-three billion, four hundred thirty-two million, six hundred seventy-two thousand, nine hundred forty-five".