16749788407909 has 2 divisors, whose sum is σ = 16749788407910. Its totient is φ = 16749788407908.

The previous prime is 16749788407853. The next prime is 16749788407921. The reversal of 16749788407909 is 90970488794761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8470806516225 + 8278981891684 = 2910465^2 + 2877322^2 .

It is a cyclic number.

It is not a de Polignac number, because 16749788407909 - 2⁹ = 16749788407397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16749788407949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8374894203954 + 8374894203955.

It is an arithmetic number, because the mean of its divisors is an integer number (8374894203955).

Almost surely, 2^{16749788407909} is an apocalyptic number.

It is an amenable number.

16749788407909 is a deficient number, since it is larger than the sum of its proper divisors (1).

16749788407909 is an equidigital number, since it uses as much as digits as its factorization.

16749788407909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536288768, while the sum is 79.

The spelling of 16749788407909 in words is "sixteen trillion, seven hundred forty-nine billion, seven hundred eighty-eight million, four hundred seven thousand, nine hundred nine".