66298313 has 2 divisors, whose sum is σ = 66298314. Its totient is φ = 66298312.

The previous prime is 66298291. The next prime is 66298327. The reversal of 66298313 is 31389266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57957769 + 8340544 = 7613^2 + 2888^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66298313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66298333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33149156 + 33149157.

It is an arithmetic number, because the mean of its divisors is an integer number (33149157).

Almost surely, 2^66298313 is an apocalyptic number.

It is an amenable number.

66298313 is a deficient number, since it is larger than the sum of its proper divisors (1).

66298313 is an equidigital number, since it uses as much as digits as its factorization.

66298313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 66298313 is about 8142.3776011679. The cubic root of 66298313 is about 404.7319528983.

The spelling of 66298313 in words is "sixty-six million, two hundred ninety-eight thousand, three hundred thirteen".