66008389 has 2 divisors, whose sum is σ = 66008390. Its totient is φ = 66008388.

The previous prime is 66008359. The next prime is 66008417. The reversal of 66008389 is 98380066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63728289 + 2280100 = 7983^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 66008389 - 2⁵ = 66008357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66008309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33004194 + 33004195.

It is an arithmetic number, because the mean of its divisors is an integer number (33004195).

Almost surely, 2^66008389 is an apocalyptic number.

It is an amenable number.

66008389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66008389 is an equidigital number, since it uses as much as digits as its factorization.

66008389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 66008389 is about 8124.5546954895. The cubic root of 66008389 is about 404.1411235401.

The spelling of 66008389 in words is "sixty-six million, eight thousand, three hundred eighty-nine".