16715664509 has 2 divisors, whose sum is σ = 16715664510. Its totient is φ = 16715664508.

The previous prime is 16715664503. The next prime is 16715664521. The reversal of 16715664509 is 90546651761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13629862009 + 3085802500 = 116747^2 + 55550^2 .

It is a cyclic number.

It is not a de Polignac number, because 16715664509 - 2²⁰ = 16714615933 is a prime.

It is a super-2 number, since 2×16715664509² (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 (16715664503) 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, 8357832254 + 8357832255.

It is an arithmetic number, because the mean of its divisors is an integer number (8357832255).

Almost surely, 2^16715664509 is an apocalyptic number.

It is an amenable number.

16715664509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16715664509 is an equidigital number, since it uses as much as digits as its factorization.

16715664509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 16715664509 in words is "sixteen billion, seven hundred fifteen million, six hundred sixty-four thousand, five hundred nine".