16521353134249 has 2 divisors, whose sum is σ = 16521353134250. Its totient is φ = 16521353134248.

The previous prime is 16521353134217. The next prime is 16521353134303. The reversal of 16521353134249 is 94243135312561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15371457216025 + 1149895918224 = 3920645^2 + 1072332^2 .

It is a cyclic number.

It is not a de Polignac number, because 16521353134249 - 2⁵ = 16521353134217 is a prime.

It is not a weakly prime, because it can be changed into another prime (16521353134849) 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, 8260676567124 + 8260676567125.

It is an arithmetic number, because the mean of its divisors is an integer number (8260676567125).

Almost surely, 2^{16521353134249} is an apocalyptic number.

It is an amenable number.

16521353134249 is a deficient number, since it is larger than the sum of its proper divisors (1).

16521353134249 is an equidigital number, since it uses as much as digits as its factorization.

16521353134249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 49.

The spelling of 16521353134249 in words is "sixteen trillion, five hundred twenty-one billion, three hundred fifty-three million, one hundred thirty-four thousand, two hundred forty-nine".