66666666666737 has 2 divisors, whose sum is σ = 66666666666738. Its totient is φ = 66666666666736.

The previous prime is 66666666666647. The next prime is 66666666666749. The reversal of 66666666666737 is 73766666666666.

66666666666737 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., 66273536412736 + 393130254001 = 8140856^2 + 627001^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666666666737 - 2²² = 66666662472433 is a prime.

It is not a weakly prime, because it can be changed into another prime (66666666665737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333333333368 + 33333333333369.

It is an arithmetic number, because the mean of its divisors is an integer number (33333333333369).

Almost surely, 2^{66666666666737} is an apocalyptic number.

It is an amenable number.

66666666666737 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666666666737 is an equidigital number, since it uses as much as digits as its factorization.

66666666666737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53331167232, while the sum is 83.

The spelling of 66666666666737 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, seven hundred thirty-seven".