66310393 has 2 divisors, whose sum is σ = 66310394. Its totient is φ = 66310392.

The previous prime is 66310313. The next prime is 66310411. The reversal of 66310393 is 39301366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55532304 + 10778089 = 7452^2 + 3283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66310393 is a prime.

It is not a weakly prime, because it can be changed into another prime (66310303) 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, 33155196 + 33155197.

It is an arithmetic number, because the mean of its divisors is an integer number (33155197).

Almost surely, 2^66310393 is an apocalyptic number.

It is an amenable number.

66310393 is a deficient number, since it is larger than the sum of its proper divisors (1).

66310393 is an equidigital number, since it uses as much as digits as its factorization.

66310393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 66310393 is about 8143.1193654520. The cubic root of 66310393 is about 404.7565330364.

The spelling of 66310393 in words is "sixty-six million, three hundred ten thousand, three hundred ninety-three".