20466075457609 has 2 divisors, whose sum is σ = 20466075457610. Its totient is φ = 20466075457608.

The previous prime is 20466075457603. The next prime is 20466075457637. The reversal of 20466075457609 is 90675457066402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20351241225225 + 114834232384 = 4511235^2 + 338872^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466075457609 - 2¹¹ = 20466075455561 is a prime.

It is not a weakly prime, because it can be changed into another prime (20466075457603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10233037728804 + 10233037728805.

It is an arithmetic number, because the mean of its divisors is an integer number (10233037728805).

Almost surely, 2^{20466075457609} is an apocalyptic number.

It is an amenable number.

20466075457609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20466075457609 is an equidigital number, since it uses as much as digits as its factorization.

20466075457609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76204800, while the sum is 61.

The spelling of 20466075457609 in words is "twenty trillion, four hundred sixty-six billion, seventy-five million, four hundred fifty-seven thousand, six hundred nine".