216666266404606 has 16 divisors (see below), whose sum is σ = 325180625958720. Its totient is φ = 108272727659520.

The previous prime is 216666266404589. The next prime is 216666266404669. The reversal of 216666266404606 is 606404662666612.

It is a happy number.

216666266404606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136127275 + ... + 137709721.

It is an arithmetic number, because the mean of its divisors is an integer number (20323789122420).

Almost surely, 2^{216666266404606} is an apocalyptic number.

216666266404606 is a deficient number, since it is larger than the sum of its proper divisors (108514359554114).

216666266404606 is a wasteful number, since it uses less digits than its factorization.

216666266404606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620579.

The product of its (nonzero) digits is 107495424, while the sum is 61.

The spelling of 216666266404606 in words is "two hundred sixteen trillion, six hundred sixty-six billion, two hundred sixty-six million, four hundred four thousand, six hundred six".