20665567063 has 2 divisors, whose sum is σ = 20665567064. Its totient is φ = 20665567062.

The previous prime is 20665567031. The next prime is 20665567121. The reversal of 20665567063 is 36076556602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20665567063 - 2⁵ = 20665567031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20665667063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332783531 + 10332783532.

It is an arithmetic number, because the mean of its divisors is an integer number (10332783532).

Almost surely, 2^20665567063 is an apocalyptic number.

20665567063 is a deficient number, since it is larger than the sum of its proper divisors (1).

20665567063 is an equidigital number, since it uses as much as digits as its factorization.

20665567063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 46.

The spelling of 20665567063 in words is "twenty billion, six hundred sixty-five million, five hundred sixty-seven thousand, sixty-three".