66666667369 has 2 divisors, whose sum is σ = 66666667370. Its totient is φ = 66666667368.

The previous prime is 66666667337. The next prime is 66666667391. The reversal of 66666667369 is 96376666666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66429907600 + 236759769 = 257740^2 + 15387^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666667369 - 2⁵ = 66666667337 is a prime.

It is a super-2 number, since 2×66666667369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66666664369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333333684 + 33333333685.

It is an arithmetic number, because the mean of its divisors is an integer number (33333333685).

Almost surely, 2^66666667369 is an apocalyptic number.

It is an amenable number.

66666667369 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666667369 is an equidigital number, since it uses as much as digits as its factorization.

66666667369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317447424, while the sum is 67.

The spelling of 66666667369 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-seven thousand, three hundred sixty-nine".