66507563 has 2 divisors, whose sum is σ = 66507564. Its totient is φ = 66507562.

The previous prime is 66507533. The next prime is 66507593. The reversal of 66507563 is 36570566.

It is a balanced prime because it is at equal distance from previous prime (66507533) and next prime (66507593).

It is a cyclic number.

It is not a de Polignac number, because 66507563 - 2¹⁶ = 66442027 is a prime.

It is not a weakly prime, because it can be changed into another prime (66507523) 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, 33253781 + 33253782.

It is an arithmetic number, because the mean of its divisors is an integer number (33253782).

Almost surely, 2^66507563 is an apocalyptic number.

66507563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66507563 is an equidigital number, since it uses as much as digits as its factorization.

66507563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 38.

The square root of 66507563 is about 8155.2169192487. The cubic root of 66507563 is about 405.1573092100.

The spelling of 66507563 in words is "sixty-six million, five hundred seven thousand, five hundred sixty-three".