16543550549 has 2 divisors, whose sum is σ = 16543550550. Its totient is φ = 16543550548.

The previous prime is 16543550531. The next prime is 16543550563. The reversal of 16543550549 is 94505534561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16535388100 + 8162449 = 128590^2 + 2857^2 .

It is a cyclic number.

It is not a de Polignac number, because 16543550549 - 2⁸ = 16543550293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16540550549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8271775274 + 8271775275.

It is an arithmetic number, because the mean of its divisors is an integer number (8271775275).

Almost surely, 2^16543550549 is an apocalyptic number.

It is an amenable number.

16543550549 is a deficient number, since it is larger than the sum of its proper divisors (1).

16543550549 is an equidigital number, since it uses as much as digits as its factorization.

16543550549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 16543550549 in words is "sixteen billion, five hundred forty-three million, five hundred fifty thousand, five hundred forty-nine".