66243137 has 2 divisors, whose sum is σ = 66243138. Its totient is φ = 66243136.

The previous prime is 66243113. The next prime is 66243157. The reversal of 66243137 is 73134266.

66243137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60902416 + 5340721 = 7804^2 + 2311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66243137 is a prime.

It is not a weakly prime, because it can be changed into another prime (66243157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33121568 + 33121569.

It is an arithmetic number, because the mean of its divisors is an integer number (33121569).

Almost surely, 2^66243137 is an apocalyptic number.

It is an amenable number.

66243137 is a deficient number, since it is larger than the sum of its proper divisors (1).

66243137 is an equidigital number, since it uses as much as digits as its factorization.

66243137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 32.

The square root of 66243137 is about 8138.9886963922. The cubic root of 66243137 is about 404.6196439162.

The spelling of 66243137 in words is "sixty-six million, two hundred forty-three thousand, one hundred thirty-seven".