66636061 has 2 divisors, whose sum is σ = 66636062. Its totient is φ = 66636060.

The previous prime is 66636049. The next prime is 66636067. The reversal of 66636061 is 16063666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55204900 + 11431161 = 7430^2 + 3381^2 .

It is a cyclic number.

It is not a de Polignac number, because 66636061 - 2⁹ = 66635549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66636067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33318030 + 33318031.

It is an arithmetic number, because the mean of its divisors is an integer number (33318031).

Almost surely, 2^66636061 is an apocalyptic number.

It is an amenable number.

66636061 is a deficient number, since it is larger than the sum of its proper divisors (1).

66636061 is an equidigital number, since it uses as much as digits as its factorization.

66636061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 66636061 is about 8163.0913874586. The cubic root of 66636061 is about 405.4180735914.

The spelling of 66636061 in words is "sixty-six million, six hundred thirty-six thousand, sixty-one".