20683656683663 has 2 divisors, whose sum is σ = 20683656683664. Its totient is φ = 20683656683662.

The previous prime is 20683656683653. The next prime is 20683656683731. The reversal of 20683656683663 is 36638665638602.

It is an a-pointer prime, because the next prime (20683656683731) can be obtained adding 20683656683663 to its sum of digits (68).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20683656683663 - 2⁴⁰ = 19584145055887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20683656683593 and 20683656683602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20683656683633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10341828341831 + 10341828341832.

It is an arithmetic number, because the mean of its divisors is an integer number (10341828341832).

Almost surely, 2^{20683656683663} is an apocalyptic number.

20683656683663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20683656683663 is an equidigital number, since it uses as much as digits as its factorization.

20683656683663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806215680, while the sum is 68.

The spelling of 20683656683663 in words is "twenty trillion, six hundred eighty-three billion, six hundred fifty-six million, six hundred eighty-three thousand, six hundred sixty-three".