217632608938 has 16 divisors (see below), whose sum is σ = 338129565480. Its totient is φ = 104932171456.

The previous prime is 217632608891. The next prime is 217632608969. The reversal of 217632608938 is 839806236712.

217632608938 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 182340102169 + 35292506769 = 427013^2 + 187863^2 .

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, 2307781 + ... + 2400232.

Almost surely, 2^217632608938 is an apocalyptic number.

217632608938 is a deficient number, since it is larger than the sum of its proper divisors (120496956542).

217632608938 is a wasteful number, since it uses less digits than its factorization.

217632608938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708841.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 217632608938 in words is "two hundred seventeen billion, six hundred thirty-two million, six hundred eight thousand, nine hundred thirty-eight".