20321066256529 has 2 divisors, whose sum is σ = 20321066256530. Its totient is φ = 20321066256528.

The previous prime is 20321066256511. The next prime is 20321066256577. The reversal of 20321066256529 is 92565266012302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11815560640129 + 8505505616400 = 3437377^2 + 2916420^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321066256529 - 2²⁵ = 20321032702097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321066256599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160533128264 + 10160533128265.

It is an arithmetic number, because the mean of its divisors is an integer number (10160533128265).

Almost surely, 2^{20321066256529} is an apocalyptic number.

It is an amenable number.

20321066256529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321066256529 is an equidigital number, since it uses as much as digits as its factorization.

20321066256529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 20321066256529 in words is "twenty trillion, three hundred twenty-one billion, sixty-six million, two hundred fifty-six thousand, five hundred twenty-nine".