216106645665 has 16 divisors (see below), whose sum is σ = 345874579200. Its totient is φ = 115222228992.

The previous prime is 216106645663. The next prime is 216106645697. The reversal of 216106645665 is 566546601612.

It is not a de Polignac number, because 216106645665 - 2¹ = 216106645663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216106645663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2113945 + ... + 2213814.

It is an arithmetic number, because the mean of its divisors is an integer number (21617161200).

Almost surely, 2^216106645665 is an apocalyptic number.

It is an amenable number.

216106645665 is a deficient number, since it is larger than the sum of its proper divisors (129767933535).

216106645665 is a wasteful number, since it uses less digits than its factorization.

216106645665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331096.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 216106645665 in words is "two hundred sixteen billion, one hundred six million, six hundred forty-five thousand, six hundred sixty-five".