66879013 has 2 divisors, whose sum is σ = 66879014. Its totient is φ = 66879012.

The previous prime is 66879011. The next prime is 66879019. The reversal of 66879013 is 31097866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62204769 + 4674244 = 7887^2 + 2162^2 .

It is a cyclic number.

It is not a de Polignac number, because 66879013 - 2¹ = 66879011 is a prime.

Together with 66879011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66879011) 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, 33439506 + 33439507.

It is an arithmetic number, because the mean of its divisors is an integer number (33439507).

Almost surely, 2^66879013 is an apocalyptic number.

It is an amenable number.

66879013 is a deficient number, since it is larger than the sum of its proper divisors (1).

66879013 is an equidigital number, since it uses as much as digits as its factorization.

66879013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 66879013 is about 8177.9589751967. The cubic root of 66879013 is about 405.9101878555.

The spelling of 66879013 in words is "sixty-six million, eight hundred seventy-nine thousand, thirteen".