16551105666049 has 2 divisors, whose sum is σ = 16551105666050. Its totient is φ = 16551105666048.

The previous prime is 16551105666019. The next prime is 16551105666077. The reversal of 16551105666049 is 94066650115561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14300445617649 + 2250660048400 = 3781593^2 + 1500220^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551105666049 - 2⁹ = 16551105665537 is a prime.

It is a super-3 number, since 3×16551105666049³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (16551105666019) by changing a digit.

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 as a sum of consecutive naturals, namely, 8275552833024 + 8275552833025.

It is an arithmetic number, because the mean of its divisors is an integer number (8275552833025).

Almost surely, 2^{16551105666049} is an apocalyptic number.

It is an amenable number.

16551105666049 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551105666049 is an equidigital number, since it uses as much as digits as its factorization.

16551105666049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832000, while the sum is 55.

The spelling of 16551105666049 in words is "sixteen trillion, five hundred fifty-one billion, one hundred five million, six hundred sixty-six thousand, forty-nine".