16556165544213 has 48 divisors (see below), whose sum is σ = 25000166265984. Its totient is φ = 10538122636800.

The previous prime is 16556165544169. The next prime is 16556165544227. The reversal of 16556165544213 is 31244556165561.

16556165544213 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 6 + 165 + 54 + 421 + 3 = 666.

It is not a de Polignac number, because 16556165544213 - 2¹⁷ = 16556165413141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16556165544213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556165544313) 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 47 ways as a sum of consecutive naturals, for example, 1169791945 + ... + 1169806097.

It is an arithmetic number, because the mean of its divisors is an integer number (520836797208).

Almost surely, 2^{16556165544213} is an apocalyptic number.

It is an amenable number.

16556165544213 is a deficient number, since it is larger than the sum of its proper divisors (8444000721771).

16556165544213 is a wasteful number, since it uses less digits than its factorization.

16556165544213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24186 (or 24183 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 54.

The spelling of 16556165544213 in words is "sixteen trillion, five hundred fifty-six billion, one hundred sixty-five million, five hundred forty-four thousand, two hundred thirteen".