217388046071 has 16 divisors (see below), whose sum is σ = 272889868800. Its totient is φ = 168850601568.

The previous prime is 217388046061. The next prime is 217388046131. The reversal of 217388046071 is 170640883712.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217388046071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217388046041) 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 15 ways as a sum of consecutive naturals, for example, 35529476 + ... + 35535593.

It is an arithmetic number, because the mean of its divisors is an integer number (17055616800).

Almost surely, 2^217388046071 is an apocalyptic number.

217388046071 is a deficient number, since it is larger than the sum of its proper divisors (55501822729).

217388046071 is a wasteful number, since it uses less digits than its factorization.

217388046071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71065118.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 217388046071 in words is "two hundred seventeen billion, three hundred eighty-eight million, forty-six thousand, seventy-one".