20966579737529 has 2 divisors, whose sum is σ = 20966579737530. Its totient is φ = 20966579737528.

The previous prime is 20966579737513. The next prime is 20966579737549. The reversal of 20966579737529 is 92573797566902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16126368535225 + 4840211202304 = 4015765^2 + 2200048^2 .

It is a cyclic number.

It is not a de Polignac number, because 20966579737529 - 2⁴ = 20966579737513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20966579737529.

It is not a weakly prime, because it can be changed into another prime (20966579737549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483289868764 + 10483289868765.

It is an arithmetic number, because the mean of its divisors is an integer number (10483289868765).

Almost surely, 2^{20966579737529} is an apocalyptic number.

It is an amenable number.

20966579737529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20966579737529 is an equidigital number, since it uses as much as digits as its factorization.

20966579737529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700507600, while the sum is 77.

The spelling of 20966579737529 in words is "twenty trillion, nine hundred sixty-six billion, five hundred seventy-nine million, seven hundred thirty-seven thousand, five hundred twenty-nine".