216989879617 has 32 divisors (see below), whose sum is σ = 257990003712. Its totient is φ = 178624315584.

The previous prime is 216989879551. The next prime is 216989879629. The reversal of 216989879617 is 716978989612.

It is a cyclic number.

It is not a de Polignac number, because 216989879617 - 2²⁷ = 216855661889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216989879617.

It is not an unprimeable number, because it can be changed into a prime (216989879657) 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 31 ways as a sum of consecutive naturals, for example, 28092718 + ... + 28100440.

It is an arithmetic number, because the mean of its divisors is an integer number (8062187616).

Almost surely, 2^216989879617 is an apocalyptic number.

It is an amenable number.

216989879617 is a deficient number, since it is larger than the sum of its proper divisors (41000124095).

216989879617 is a wasteful number, since it uses less digits than its factorization.

216989879617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9157.

The product of its digits is 164602368, while the sum is 73.

The spelling of 216989879617 in words is "two hundred sixteen billion, nine hundred eighty-nine million, eight hundred seventy-nine thousand, six hundred seventeen".