16546567531661 has 2 divisors, whose sum is σ = 16546567531662. Its totient is φ = 16546567531660.

The previous prime is 16546567531621. The next prime is 16546567531699. The reversal of 16546567531661 is 16613576564561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15106483530436 + 1440084001225 = 3886706^2 + 1200035^2 .

It is a cyclic number.

It is not a de Polignac number, because 16546567531661 - 2¹⁴ = 16546567515277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16546567531594 and 16546567531603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16546567531621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8273283765830 + 8273283765831.

It is an arithmetic number, because the mean of its divisors is an integer number (8273283765831).

Almost surely, 2^{16546567531661} is an apocalyptic number.

It is an amenable number.

16546567531661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16546567531661 is an equidigital number, since it uses as much as digits as its factorization.

16546567531661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648000, while the sum is 62.

The spelling of 16546567531661 in words is "sixteen trillion, five hundred forty-six billion, five hundred sixty-seven million, five hundred thirty-one thousand, six hundred sixty-one".