16551046549 has 2 divisors, whose sum is σ = 16551046550. Its totient is φ = 16551046548.

The previous prime is 16551046543. The next prime is 16551046621. The reversal of 16551046549 is 94564015561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9431905924 + 7119140625 = 97118^2 + 84375^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551046549 - 2⁹ = 16551046037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16551046499 and 16551046508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16551046543) 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, 8275523274 + 8275523275.

It is an arithmetic number, because the mean of its divisors is an integer number (8275523275).

Almost surely, 2^16551046549 is an apocalyptic number.

It is an amenable number.

16551046549 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551046549 is an equidigital number, since it uses as much as digits as its factorization.

16551046549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 16551046549 in words is "sixteen billion, five hundred fifty-one million, forty-six thousand, five hundred forty-nine".