201606616645 has 16 divisors (see below), whose sum is σ = 276515406720. Its totient is φ = 138231370944.

The previous prime is 201606616637. The next prime is 201606616669. The reversal of 201606616645 is 546616606102.

201606616645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 201606616645 - 2³ = 201606616637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105874 + ... + 643756.

It is an arithmetic number, because the mean of its divisors is an integer number (17282212920).

Almost surely, 2^201606616645 is an apocalyptic number.

It is an amenable number.

201606616645 is a deficient number, since it is larger than the sum of its proper divisors (74908790075).

201606616645 is a wasteful number, since it uses less digits than its factorization.

201606616645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548604.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 201606616645 in words is "two hundred one billion, six hundred six million, six hundred sixteen thousand, six hundred forty-five".