66678579313 has 2 divisors, whose sum is σ = 66678579314. Its totient is φ = 66678579312.

The previous prime is 66678579311. The next prime is 66678579343. The reversal of 66678579313 is 31397587666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36377169984 + 30301409329 = 190728^2 + 174073^2 .

It is a cyclic number.

It is not a de Polignac number, because 66678579313 - 2¹ = 66678579311 is a prime.

Together with 66678579311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66678579311) 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, 33339289656 + 33339289657.

It is an arithmetic number, because the mean of its divisors is an integer number (33339289657).

Almost surely, 2^66678579313 is an apocalyptic number.

It is an amenable number.

66678579313 is a deficient number, since it is larger than the sum of its proper divisors (1).

66678579313 is an equidigital number, since it uses as much as digits as its factorization.

66678579313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34292160, while the sum is 61.

The spelling of 66678579313 in words is "sixty-six billion, six hundred seventy-eight million, five hundred seventy-nine thousand, three hundred thirteen".