217539856882 has 16 divisors (see below), whose sum is σ = 331674979032. Its totient is φ = 106981701120.

The previous prime is 217539856843. The next prime is 217539856913. The reversal of 217539856882 is 288658935712.

217539856882 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 114305524281 + 103234332601 = 338091^2 + 321301^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4474818 + ... + 4523170.

Almost surely, 2^217539856882 is an apocalyptic number.

217539856882 is a deficient number, since it is larger than the sum of its proper divisors (114135122150).

217539856882 is a wasteful number, since it uses less digits than its factorization.

217539856882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85293.

The product of its digits is 58060800, while the sum is 64.

The spelling of 217539856882 in words is "two hundred seventeen billion, five hundred thirty-nine million, eight hundred fifty-six thousand, eight hundred eighty-two".