66087409 has 2 divisors, whose sum is σ = 66087410. Its totient is φ = 66087408.

The previous prime is 66087403. The next prime is 66087419. The reversal of 66087409 is 90478066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43191184 + 22896225 = 6572^2 + 4785^2 .

It is a cyclic number.

It is not a de Polignac number, because 66087409 - 2¹¹ = 66085361 is a prime.

It is not a weakly prime, because it can be changed into another prime (66087403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33043704 + 33043705.

It is an arithmetic number, because the mean of its divisors is an integer number (33043705).

Almost surely, 2^66087409 is an apocalyptic number.

It is an amenable number.

66087409 is a deficient number, since it is larger than the sum of its proper divisors (1).

66087409 is an equidigital number, since it uses as much as digits as its factorization.

66087409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66087409 is about 8129.4162767077. The cubic root of 66087409 is about 404.3023277804.

The spelling of 66087409 in words is "sixty-six million, eighty-seven thousand, four hundred nine".