216644672409 has 16 divisors (see below), whose sum is σ = 328820373504. Its totient is φ = 125591114000.

The previous prime is 216644672393. The next prime is 216644672417. The reversal of 216644672409 is 904276446612.

216644672409 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 216644672409 - 2⁴ = 216644672393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216644672449) 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, 142716417 + ... + 142717934.

It is an arithmetic number, because the mean of its divisors is an integer number (20551273344).

Almost surely, 2^216644672409 is an apocalyptic number.

It is an amenable number.

216644672409 is a deficient number, since it is larger than the sum of its proper divisors (112175701095).

216644672409 is a wasteful number, since it uses less digits than its factorization.

216644672409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285434388.

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 216644672409 in words is "two hundred sixteen billion, six hundred forty-four million, six hundred seventy-two thousand, four hundred nine".