20530555663 has 2 divisors, whose sum is σ = 20530555664. Its totient is φ = 20530555662.

The previous prime is 20530555637. The next prime is 20530555667. The reversal of 20530555663 is 36655503502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20530555663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20530555667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265277831 + 10265277832.

It is an arithmetic number, because the mean of its divisors is an integer number (10265277832).

Almost surely, 2^20530555663 is an apocalyptic number.

20530555663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20530555663 is an equidigital number, since it uses as much as digits as its factorization.

20530555663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405000, while the sum is 40.

The spelling of 20530555663 in words is "twenty billion, five hundred thirty million, five hundred fifty-five thousand, six hundred sixty-three".