217900685223 has 96 divisors (see below), whose sum is σ = 369033408000. Its totient is φ = 126663264000.

The previous prime is 217900685203. The next prime is 217900685237. The reversal of 217900685223 is 322586009712.

It is not a de Polignac number, because 217900685223 - 2⁹ = 217900684711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217900685203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 31120723 + ... + 31127723.

It is an arithmetic number, because the mean of its divisors is an integer number (3844098000).

Almost surely, 2^217900685223 is an apocalyptic number.

217900685223 is a deficient number, since it is larger than the sum of its proper divisors (151132722777).

217900685223 is a wasteful number, since it uses less digits than its factorization.

217900685223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7414 (or 7395 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 217900685223 in words is "two hundred seventeen billion, nine hundred million, six hundred eighty-five thousand, two hundred twenty-three".