216881726876817 has 16 divisors (see below), whose sum is σ = 290438296211712. Its totient is φ = 143957274439680.

The previous prime is 216881726876813. The next prime is 216881726876887. The reversal of 216881726876817 is 718678627188612.

It is not a de Polignac number, because 216881726876817 - 2² = 216881726876813 is a prime.

It is a super-2 number, since 2×216881726876817² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216881726876813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97235184 + ... + 99440657.

It is an arithmetic number, because the mean of its divisors is an integer number (18152393513232).

Almost surely, 2^{216881726876817} is an apocalyptic number.

It is an amenable number.

216881726876817 is a deficient number, since it is larger than the sum of its proper divisors (73556569334895).

216881726876817 is a wasteful number, since it uses less digits than its factorization.

216881726876817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196677448.

The product of its digits is 1213857792, while the sum is 78.

The spelling of 216881726876817 in words is "two hundred sixteen trillion, eight hundred eighty-one billion, seven hundred twenty-six million, eight hundred seventy-six thousand, eight hundred seventeen".