16515832909 has 2 divisors, whose sum is σ = 16515832910. Its totient is φ = 16515832908.

The previous prime is 16515832873. The next prime is 16515832961. The reversal of 16515832909 is 90923851561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12487392009 + 4028440900 = 111747^2 + 63470^2 .

It is an emirp because it is prime and its reverse (90923851561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16515832909 - 2¹⁷ = 16515701837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16515832969) 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, 8257916454 + 8257916455.

It is an arithmetic number, because the mean of its divisors is an integer number (8257916455).

Almost surely, 2^16515832909 is an apocalyptic number.

It is an amenable number.

16515832909 is a deficient number, since it is larger than the sum of its proper divisors (1).

16515832909 is an equidigital number, since it uses as much as digits as its factorization.

16515832909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 16515832909 in words is "sixteen billion, five hundred fifteen million, eight hundred thirty-two thousand, nine hundred nine".