66987611 has 2 divisors, whose sum is σ = 66987612. Its totient is φ = 66987610.

The previous prime is 66987551. The next prime is 66987619. The reversal of 66987611 is 11678966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66987611 - 2¹⁴ = 66971227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66987619) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33493805 + 33493806.

It is an arithmetic number, because the mean of its divisors is an integer number (33493806).

Almost surely, 2^66987611 is an apocalyptic number.

66987611 is a deficient number, since it is larger than the sum of its proper divisors (1).

66987611 is an equidigital number, since it uses as much as digits as its factorization.

66987611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 66987611 is about 8184.5959582621. The cubic root of 66987611 is about 406.1297744121.

The spelling of 66987611 in words is "sixty-six million, nine hundred eighty-seven thousand, six hundred eleven".