216954809673 has 16 divisors (see below), whose sum is σ = 337344700800. Its totient is φ = 123974176368.

The previous prime is 216954809671. The next prime is 216954809681. The reversal of 216954809673 is 376908459612.

It is not a de Polignac number, because 216954809673 - 2¹ = 216954809671 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216954809671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105419190 + ... + 105421247.

It is an arithmetic number, because the mean of its divisors is an integer number (21084043800).

It is a 1-persistent number, because it is pandigital, but 2⋅216954809673 = 433909619346 is not.

Almost surely, 2^216954809673 is an apocalyptic number.

It is an amenable number.

216954809673 is a deficient number, since it is larger than the sum of its proper divisors (120389891127).

216954809673 is an equidigital number, since it uses as much as digits as its factorization.

216954809673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210840461 (or 210840447 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 60.

The spelling of 216954809673 in words is "two hundred sixteen billion, nine hundred fifty-four million, eight hundred nine thousand, six hundred seventy-three".