66644093 has 2 divisors, whose sum is σ = 66644094. Its totient is φ = 66644092.

The previous prime is 66644089. The next prime is 66644111. The reversal of 66644093 is 39044666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44863204 + 21780889 = 6698^2 + 4667^2 .

It is a cyclic number.

It is not a de Polignac number, because 66644093 - 2² = 66644089 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66644033) 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, 33322046 + 33322047.

It is an arithmetic number, because the mean of its divisors is an integer number (33322047).

Almost surely, 2^66644093 is an apocalyptic number.

It is an amenable number.

66644093 is a deficient number, since it is larger than the sum of its proper divisors (1).

66644093 is an equidigital number, since it uses as much as digits as its factorization.

66644093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 66644093 is about 8163.5833431159. The cubic root of 66644093 is about 405.4343620049.

The spelling of 66644093 in words is "sixty-six million, six hundred forty-four thousand, ninety-three".