66005389 has 2 divisors, whose sum is σ = 66005390. Its totient is φ = 66005388.

The previous prime is 66005371. The next prime is 66005453. The reversal of 66005389 is 98350066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 233289 = 8110^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 66005389 - 2¹¹ = 66003341 is a prime.

It is a super-2 number, since 2×66005389² = 8713422754082642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66005309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33002694 + 33002695.

It is an arithmetic number, because the mean of its divisors is an integer number (33002695).

Almost surely, 2^66005389 is an apocalyptic number.

It is an amenable number.

66005389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66005389 is an equidigital number, since it uses as much as digits as its factorization.

66005389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 66005389 is about 8124.3700678883. The cubic root of 66005389 is about 404.1350008752.

The spelling of 66005389 in words is "sixty-six million, five thousand, three hundred eighty-nine".