66165653 has 2 divisors, whose sum is σ = 66165654. Its totient is φ = 66165652.

The previous prime is 66165643. The next prime is 66165679. The reversal of 66165653 is 35656166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39715204 + 26450449 = 6302^2 + 5143^2 .

It is a cyclic number.

It is not a de Polignac number, because 66165653 - 2⁴ = 66165637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66165643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082826 + 33082827.

It is an arithmetic number, because the mean of its divisors is an integer number (33082827).

Almost surely, 2^66165653 is an apocalyptic number.

It is an amenable number.

66165653 is a deficient number, since it is larger than the sum of its proper divisors (1).

66165653 is an equidigital number, since it uses as much as digits as its factorization.

66165653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 38.

The square root of 66165653 is about 8134.2272527881. The cubic root of 66165653 is about 404.4618223831.

The spelling of 66165653 in words is "sixty-six million, one hundred sixty-five thousand, six hundred fifty-three".