1666683366737 has 2 divisors, whose sum is σ = 1666683366738. Its totient is φ = 1666683366736.

The previous prime is 1666683366721. The next prime is 1666683366739. The reversal of 1666683366737 is 7376633866661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 909993892096 + 756689474641 = 953936^2 + 869879^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666683366737 - 2⁴ = 1666683366721 is a prime.

Together with 1666683366739, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1666683366739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833341683368 + 833341683369.

It is an arithmetic number, because the mean of its divisors is an integer number (833341683369).

Almost surely, 2^{1666683366737} is an apocalyptic number.

It is an amenable number.

1666683366737 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666683366737 is an equidigital number, since it uses as much as digits as its factorization.

1666683366737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493807104, while the sum is 68.

The spelling of 1666683366737 in words is "one trillion, six hundred sixty-six billion, six hundred eighty-three million, three hundred sixty-six thousand, seven hundred thirty-seven".