66111587 has 2 divisors, whose sum is σ = 66111588. Its totient is φ = 66111586.

The previous prime is 66111559. The next prime is 66111593. The reversal of 66111587 is 78511166.

66111587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66111587 - 2⁶ = 66111523 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66111527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33055793 + 33055794.

It is an arithmetic number, because the mean of its divisors is an integer number (33055794).

Almost surely, 2^66111587 is an apocalyptic number.

66111587 is a deficient number, since it is larger than the sum of its proper divisors (1).

66111587 is an equidigital number, since it uses as much as digits as its factorization.

66111587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 66111587 is about 8130.9032093612. The cubic root of 66111587 is about 404.3516262776.

The spelling of 66111587 in words is "sixty-six million, one hundred eleven thousand, five hundred eighty-seven".