16554471733661 has 4 divisors (see below), whose sum is σ = 16579823145852. Its totient is φ = 16529120321472.

The previous prime is 16554471733649. The next prime is 16554471733697. The reversal of 16554471733661 is 16633717445561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1197525319225 + 15356946414436 = 1094315^2 + 3918794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16554471733661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16554471733661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16554471733561) 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 3 ways as a sum of consecutive naturals, for example, 12675705116 + ... + 12675706421.

It is an arithmetic number, because the mean of its divisors is an integer number (4144955786463).

Almost surely, 2^{16554471733661} is an apocalyptic number.

It is an amenable number.

16554471733661 is a deficient number, since it is larger than the sum of its proper divisors (25351412191).

16554471733661 is an equidigital number, since it uses as much as digits as its factorization.

16554471733661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25351412190.

The product of its digits is 38102400, while the sum is 59.

The spelling of 16554471733661 in words is "sixteen trillion, five hundred fifty-four billion, four hundred seventy-one million, seven hundred thirty-three thousand, six hundred sixty-one".