66240040667 has 2 divisors, whose sum is σ = 66240040668. Its totient is φ = 66240040666.

The previous prime is 66240040589. The next prime is 66240040679. The reversal of 66240040667 is 76604004266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66240040667 - 2²⁴ = 66223263451 is a prime.

It is not a weakly prime, because it can be changed into another prime (66240040697) 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, 33120020333 + 33120020334.

It is an arithmetic number, because the mean of its divisors is an integer number (33120020334).

Almost surely, 2^66240040667 is an apocalyptic number.

66240040667 is a deficient number, since it is larger than the sum of its proper divisors (1).

66240040667 is an equidigital number, since it uses as much as digits as its factorization.

66240040667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 66240040667 in words is "sixty-six billion, two hundred forty million, forty thousand, six hundred sixty-seven".