16565432607541 has 2 divisors, whose sum is σ = 16565432607542. Its totient is φ = 16565432607540.

The previous prime is 16565432607481. The next prime is 16565432607557. The reversal of 16565432607541 is 14570623456561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16294664322225 + 270768285316 = 4036665^2 + 520354^2 .

It is an emirp because it is prime and its reverse (14570623456561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16565432607541 - 2⁹ = 16565432607029 is a prime.

It is a super-2 number, since 2×16565432607541² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16565432604541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282716303770 + 8282716303771.

It is an arithmetic number, because the mean of its divisors is an integer number (8282716303771).

Almost surely, 2^{16565432607541} is an apocalyptic number.

It is an amenable number.

16565432607541 is a deficient number, since it is larger than the sum of its proper divisors (1).

16565432607541 is an equidigital number, since it uses as much as digits as its factorization.

16565432607541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144000, while the sum is 55.

The spelling of 16565432607541 in words is "sixteen trillion, five hundred sixty-five billion, four hundred thirty-two million, six hundred seven thousand, five hundred forty-one".