16516516499869 has 2 divisors, whose sum is σ = 16516516499870. Its totient is φ = 16516516499868.

The previous prime is 16516516499867. The next prime is 16516516500059. The reversal of 16516516499869 is 96899461561561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16339485937369 + 177030562500 = 4042213^2 + 420750^2 .

It is a cyclic number.

It is not a de Polignac number, because 16516516499869 - 2¹ = 16516516499867 is a prime.

It is a super-2 number, since 2×16516516499869² (a number of 27 digits) contains 22 as substring.

Together with 16516516499867, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 16516516499795 and 16516516499804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16516516499863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8258258249934 + 8258258249935.

It is an arithmetic number, because the mean of its divisors is an integer number (8258258249935).

Almost surely, 2^{16516516499869} is an apocalyptic number.

It is an amenable number.

16516516499869 is a deficient number, since it is larger than the sum of its proper divisors (1).

16516516499869 is an equidigital number, since it uses as much as digits as its factorization.

16516516499869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 755827200, while the sum is 76.

The spelling of 16516516499869 in words is "sixteen trillion, five hundred sixteen billion, five hundred sixteen million, four hundred ninety-nine thousand, eight hundred sixty-nine".