66994313 has 2 divisors, whose sum is σ = 66994314. Its totient is φ = 66994312.

The previous prime is 66994303. The next prime is 66994327. The reversal of 66994313 is 31349966.

66994313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64128064 + 2866249 = 8008^2 + 1693^2 .

It is a cyclic number.

It is not a de Polignac number, because 66994313 - 2²² = 62800009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66994303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33497156 + 33497157.

It is an arithmetic number, because the mean of its divisors is an integer number (33497157).

Almost surely, 2^66994313 is an apocalyptic number.

It is an amenable number.

66994313 is a deficient number, since it is larger than the sum of its proper divisors (1).

66994313 is an equidigital number, since it uses as much as digits as its factorization.

66994313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 41.

The square root of 66994313 is about 8185.0053756855. The cubic root of 66994313 is about 406.1433181652.

The spelling of 66994313 in words is "sixty-six million, nine hundred ninety-four thousand, three hundred thirteen".