66580555508563 has 2 divisors, whose sum is σ = 66580555508564. Its totient is φ = 66580555508562.

The previous prime is 66580555508507. The next prime is 66580555508573. The reversal of 66580555508563 is 36580555508566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66580555508563 is a prime.

It is not a weakly prime, because it can be changed into another prime (66580555508573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33290277754281 + 33290277754282.

It is an arithmetic number, because the mean of its divisors is an integer number (33290277754282).

Almost surely, 2^{66580555508563} is an apocalyptic number.

66580555508563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66580555508563 is an equidigital number, since it uses as much as digits as its factorization.

66580555508563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648000000, while the sum is 67.

The spelling of 66580555508563 in words is "sixty-six trillion, five hundred eighty billion, five hundred fifty-five million, five hundred eight thousand, five hundred sixty-three".