216766656107 has 4 divisors (see below), whose sum is σ = 229517635896. Its totient is φ = 204015676320.

The previous prime is 216766656077. The next prime is 216766656151. The reversal of 216766656107 is 701656667612.

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 216766656107 - 2¹⁶ = 216766590571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216766656167) 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, 6375489869 + ... + 6375489902.

It is an arithmetic number, because the mean of its divisors is an integer number (57379408974).

Almost surely, 2^216766656107 is an apocalyptic number.

216766656107 is a deficient number, since it is larger than the sum of its proper divisors (12750979789).

216766656107 is a wasteful number, since it uses less digits than its factorization.

216766656107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12750979788.

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 216766656107 in words is "two hundred sixteen billion, seven hundred sixty-six million, six hundred fifty-six thousand, one hundred seven".