20612311242689 has 2 divisors, whose sum is σ = 20612311242690. Its totient is φ = 20612311242688.

The previous prime is 20612311242667. The next prime is 20612311242701. The reversal of 20612311242689 is 98624211321602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17619912921664 + 2992398321025 = 4197608^2 + 1729855^2 .

It is a cyclic number.

It is not a de Polignac number, because 20612311242689 - 2⁸ = 20612311242433 is a prime.

It is not a weakly prime, because it can be changed into another prime (20612311242629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306155621344 + 10306155621345.

It is an arithmetic number, because the mean of its divisors is an integer number (10306155621345).

Almost surely, 2^{20612311242689} is an apocalyptic number.

It is an amenable number.

20612311242689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20612311242689 is an equidigital number, since it uses as much as digits as its factorization.

20612311242689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 20612311242689 in words is "twenty trillion, six hundred twelve billion, three hundred eleven million, two hundred forty-two thousand, six hundred eighty-nine".