216640522233 has 12 divisors (see below), whose sum is σ = 323019560448. Its totient is φ = 139768078680.

The previous prime is 216640522229. The next prime is 216640522271. The reversal of 216640522233 is 332225046612.

216640522233 is a `hidden beast` number, since 2 + 1 + 6 + 640 + 5 + 2 + 2 + 2 + 3 + 3 = 666.

It is not a de Polignac number, because 216640522233 - 2² = 216640522229 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216640522333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 388244385 + ... + 388244942.

It is an arithmetic number, because the mean of its divisors is an integer number (26918296704).

Almost surely, 2^216640522233 is an apocalyptic number.

It is an amenable number.

216640522233 is a deficient number, since it is larger than the sum of its proper divisors (106379038215).

216640522233 is a wasteful number, since it uses less digits than its factorization.

216640522233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776489364 (or 776489361 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 216640522233 its reverse (332225046612), we get a palindrome (548865568845).

The spelling of 216640522233 in words is "two hundred sixteen billion, six hundred forty million, five hundred twenty-two thousand, two hundred thirty-three".