66116563 has 2 divisors, whose sum is σ = 66116564. Its totient is φ = 66116562.

The previous prime is 66116551. The next prime is 66116573. The reversal of 66116563 is 36561166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66116563 - 2⁹ = 66116051 is a prime.

It is not a weakly prime, because it can be changed into another prime (66116543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33058281 + 33058282.

It is an arithmetic number, because the mean of its divisors is an integer number (33058282).

Almost surely, 2^66116563 is an apocalyptic number.

66116563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66116563 is an equidigital number, since it uses as much as digits as its factorization.

66116563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 66116563 is about 8131.2091966693. The cubic root of 66116563 is about 404.3617707586.

The spelling of 66116563 in words is "sixty-six million, one hundred sixteen thousand, five hundred sixty-three".