66165389 has 2 divisors, whose sum is σ = 66165390. Its totient is φ = 66165388.

The previous prime is 66165367. The next prime is 66165409. The reversal of 66165389 is 98356166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35307364 + 30858025 = 5942^2 + 5555^2 .

It is a cyclic number.

It is not a de Polignac number, because 66165389 - 2⁸ = 66165133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66165689) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082694 + 33082695.

It is an arithmetic number, because the mean of its divisors is an integer number (33082695).

Almost surely, 2^66165389 is an apocalyptic number.

It is an amenable number.

66165389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66165389 is an equidigital number, since it uses as much as digits as its factorization.

66165389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The square root of 66165389 is about 8134.2110250472. The cubic root of 66165389 is about 404.4612844501.

The spelling of 66165389 in words is "sixty-six million, one hundred sixty-five thousand, three hundred eighty-nine".