16546365561661 has 8 divisors (see below), whose sum is σ = 17899069475840. Its totient is φ = 15205076870832.

The previous prime is 16546365561599. The next prime is 16546365561683. The reversal of 16546365561661 is 16616556364561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16546365561661 is a prime.

It is a super-3 number, since 3×16546365561661³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16546365561661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16546365561961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2853802821 + ... + 2853808618.

It is an arithmetic number, because the mean of its divisors is an integer number (2237383684480).

Almost surely, 2^{16546365561661} is an apocalyptic number.

It is an amenable number.

16546365561661 is a deficient number, since it is larger than the sum of its proper divisors (1352703914179).

16546365561661 is a wasteful number, since it uses less digits than its factorization.

16546365561661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5707611675.

The product of its digits is 69984000, while the sum is 61.

The spelling of 16546365561661 in words is "sixteen trillion, five hundred forty-six billion, three hundred sixty-five million, five hundred sixty-one thousand, six hundred sixty-one".