216662598811 has 4 divisors (see below), whose sum is σ = 216679962352. Its totient is φ = 216645235272.

The previous prime is 216662598809. The next prime is 216662598877. The reversal of 216662598811 is 118895266612.

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 216662598811 - 2¹ = 216662598809 is a prime.

It is a super-2 number, since 2×216662598811² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216662598881) 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, 8663040 + ... + 8688013.

It is an arithmetic number, because the mean of its divisors is an integer number (54169990588).

Almost surely, 2^216662598811 is an apocalyptic number.

216662598811 is a deficient number, since it is larger than the sum of its proper divisors (17363541).

216662598811 is a wasteful number, since it uses less digits than its factorization.

216662598811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17363540.

The product of its digits is 2488320, while the sum is 55.

The spelling of 216662598811 in words is "two hundred sixteen billion, six hundred sixty-two million, five hundred ninety-eight thousand, eight hundred eleven".