16606561645537 has 2 divisors, whose sum is σ = 16606561645538. Its totient is φ = 16606561645536.

The previous prime is 16606561645501. The next prime is 16606561645549. The reversal of 16606561645537 is 73554616560661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12394068111441 + 4212493534096 = 3520521^2 + 2052436^2 .

It is a cyclic number.

It is not a de Polignac number, because 16606561645537 - 2⁴³ = 7810468623329 is a prime.

It is not a weakly prime, because it can be changed into another prime (16606561643537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8303280822768 + 8303280822769.

It is an arithmetic number, because the mean of its divisors is an integer number (8303280822769).

Almost surely, 2^{16606561645537} is an apocalyptic number.

It is an amenable number.

16606561645537 is a deficient number, since it is larger than the sum of its proper divisors (1).

16606561645537 is an equidigital number, since it uses as much as digits as its factorization.

16606561645537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648000, while the sum is 61.

The spelling of 16606561645537 in words is "sixteen trillion, six hundred six billion, five hundred sixty-one million, six hundred forty-five thousand, five hundred thirty-seven".