66867413 has 2 divisors, whose sum is σ = 66867414. Its totient is φ = 66867412.

The previous prime is 66867401. The next prime is 66867457. The reversal of 66867413 is 31476866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62615569 + 4251844 = 7913^2 + 2062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66867413 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66867013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33433706 + 33433707.

It is an arithmetic number, because the mean of its divisors is an integer number (33433707).

Almost surely, 2^66867413 is an apocalyptic number.

It is an amenable number.

66867413 is a deficient number, since it is larger than the sum of its proper divisors (1).

66867413 is an equidigital number, since it uses as much as digits as its factorization.

66867413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 66867413 is about 8177.2497210248. The cubic root of 66867413 is about 405.8867184580.

The spelling of 66867413 in words is "sixty-six million, eight hundred sixty-seven thousand, four hundred thirteen".