66643337 has 2 divisors, whose sum is σ = 66643338. Its totient is φ = 66643336.

The previous prime is 66643333. The next prime is 66643361. The reversal of 66643337 is 73334666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46022656 + 20620681 = 6784^2 + 4541^2 .

It is a cyclic number.

It is not a de Polignac number, because 66643337 - 2² = 66643333 is a prime.

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 66643337.

It is not a weakly prime, because it can be changed into another prime (66643333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33321668 + 33321669.

It is an arithmetic number, because the mean of its divisors is an integer number (33321669).

Almost surely, 2^66643337 is an apocalyptic number.

It is an amenable number.

66643337 is a deficient number, since it is larger than the sum of its proper divisors (1).

66643337 is an equidigital number, since it uses as much as digits as its factorization.

66643337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 38.

The square root of 66643337 is about 8163.5370397886. The cubic root of 66643337 is about 405.4328289381.

It can be divided in two parts, 6664 and 3337, that added together give a palindrome (10001).

The spelling of 66643337 in words is "sixty-six million, six hundred forty-three thousand, three hundred thirty-seven".