20866311496769 has 2 divisors, whose sum is σ = 20866311496770. Its totient is φ = 20866311496768.

The previous prime is 20866311496759. The next prime is 20866311496813. The reversal of 20866311496769 is 96769411366802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18684974502544 + 2181336994225 = 4322612^2 + 1476935^2 .

It is a cyclic number.

It is not a de Polignac number, because 20866311496769 - 2²⁴ = 20866294719553 is a prime.

It is a super-2 number, since 2×20866311496769² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20866311496699 and 20866311496708.

It is not a weakly prime, because it can be changed into another prime (20866311496759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10433155748384 + 10433155748385.

It is an arithmetic number, because the mean of its divisors is an integer number (10433155748385).

Almost surely, 2^{20866311496769} is an apocalyptic number.

It is an amenable number.

20866311496769 is a deficient number, since it is larger than the sum of its proper divisors (1).

20866311496769 is an equidigital number, since it uses as much as digits as its factorization.

20866311496769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141087744, while the sum is 68.

The spelling of 20866311496769 in words is "twenty trillion, eight hundred sixty-six billion, three hundred eleven million, four hundred ninety-six thousand, seven hundred sixty-nine".