66484393 has 2 divisors, whose sum is σ = 66484394. Its totient is φ = 66484392.

The previous prime is 66484391. The next prime is 66484403. The reversal of 66484393 is 39348466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 501264 = 8123^2 + 708^2 .

It is a cyclic number.

It is not a de Polignac number, because 66484393 - 2¹ = 66484391 is a prime.

Together with 66484391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66484391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33242196 + 33242197.

It is an arithmetic number, because the mean of its divisors is an integer number (33242197).

Almost surely, 2^66484393 is an apocalyptic number.

It is an amenable number.

66484393 is a deficient number, since it is larger than the sum of its proper divisors (1).

66484393 is an equidigital number, since it uses as much as digits as its factorization.

66484393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 43.

The square root of 66484393 is about 8153.7962324306. The cubic root of 66484393 is about 405.1102539840.

The spelling of 66484393 in words is "sixty-six million, four hundred eighty-four thousand, three hundred ninety-three".