16596509081 has 2 divisors, whose sum is σ = 16596509082. Its totient is φ = 16596509080.

The previous prime is 16596509053. The next prime is 16596509087. The reversal of 16596509081 is 18090569561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15796467856 + 800041225 = 125684^2 + 28285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16596509081 is a prime.

It is a super-2 number, since 2×16596509081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16596509087) 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, 8298254540 + 8298254541.

It is an arithmetic number, because the mean of its divisors is an integer number (8298254541).

Almost surely, 2^16596509081 is an apocalyptic number.

It is an amenable number.

16596509081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16596509081 is an equidigital number, since it uses as much as digits as its factorization.

16596509081 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 50.

The spelling of 16596509081 in words is "sixteen billion, five hundred ninety-six million, five hundred nine thousand, eighty-one".