16504644469 has 2 divisors, whose sum is σ = 16504644470. Its totient is φ = 16504644468.

The previous prime is 16504644449. The next prime is 16504644509. The reversal of 16504644469 is 96444640561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13579240900 + 2925403569 = 116530^2 + 54087^2 .

It is an emirp because it is prime and its reverse (96444640561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16504644469 - 2¹⁹ = 16504120181 is a prime.

It is a super-2 number, since 2×16504644469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16504644449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252322234 + 8252322235.

It is an arithmetic number, because the mean of its divisors is an integer number (8252322235).

Almost surely, 2^16504644469 is an apocalyptic number.

It is an amenable number.

16504644469 is a deficient number, since it is larger than the sum of its proper divisors (1).

16504644469 is an equidigital number, since it uses as much as digits as its factorization.

16504644469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 16504644469 in words is "sixteen billion, five hundred four million, six hundred forty-four thousand, four hundred sixty-nine".