20963647798789 has 2 divisors, whose sum is σ = 20963647798790. Its totient is φ = 20963647798788.

The previous prime is 20963647798783. The next prime is 20963647798813. The reversal of 20963647798789 is 98789774636902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17626705305889 + 3336942492900 = 4198417^2 + 1826730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20963647798789 - 2³ = 20963647798781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20963647798781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481823899394 + 10481823899395.

It is an arithmetic number, because the mean of its divisors is an integer number (10481823899395).

Almost surely, 2^{20963647798789} is an apocalyptic number.

It is an amenable number.

20963647798789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20963647798789 is an equidigital number, since it uses as much as digits as its factorization.

20963647798789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13826598912, while the sum is 85.

The spelling of 20963647798789 in words is "twenty trillion, nine hundred sixty-three billion, six hundred forty-seven million, seven hundred ninety-eight thousand, seven hundred eighty-nine".