66165637 has 2 divisors, whose sum is σ = 66165638. Its totient is φ = 66165636.

The previous prime is 66165629. The next prime is 66165643. The reversal of 66165637 is 73656166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35628961 + 30536676 = 5969^2 + 5526^2 .

It is a cyclic number.

It is not a de Polignac number, because 66165637 - 2³ = 66165629 is a prime.

It is a super-3 number, since 3×66165637³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66165637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66165937) 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, 33082818 + 33082819.

It is an arithmetic number, because the mean of its divisors is an integer number (33082819).

Almost surely, 2^66165637 is an apocalyptic number.

It is an amenable number.

66165637 is a deficient number, since it is larger than the sum of its proper divisors (1).

66165637 is an equidigital number, since it uses as much as digits as its factorization.

66165637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 40.

The square root of 66165637 is about 8134.2262692895. The cubic root of 66165637 is about 404.4617897812.

The spelling of 66165637 in words is "sixty-six million, one hundred sixty-five thousand, six hundred thirty-seven".