216934965871 has 4 divisors (see below), whose sum is σ = 233622270952. Its totient is φ = 200247660792.

The previous prime is 216934965869. The next prime is 216934965887. The reversal of 216934965871 is 178569439612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216934965871 - 2¹ = 216934965869 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 (216934965671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8343652521 + ... + 8343652546.

It is an arithmetic number, because the mean of its divisors is an integer number (58405567738).

Almost surely, 2^216934965871 is an apocalyptic number.

216934965871 is a deficient number, since it is larger than the sum of its proper divisors (16687305081).

216934965871 is a wasteful number, since it uses less digits than its factorization.

216934965871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16687305080.

The product of its digits is 19595520, while the sum is 61.

The spelling of 216934965871 in words is "two hundred sixteen billion, nine hundred thirty-four million, nine hundred sixty-five thousand, eight hundred seventy-one".