66733945687 has 2 divisors, whose sum is σ = 66733945688. Its totient is φ = 66733945686.

The previous prime is 66733945679. The next prime is 66733945709. The reversal of 66733945687 is 78654933766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66733945687 - 2³ = 66733945679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66733945667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33366972843 + 33366972844.

It is an arithmetic number, because the mean of its divisors is an integer number (33366972844).

Almost surely, 2^66733945687 is an apocalyptic number.

66733945687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66733945687 is an equidigital number, since it uses as much as digits as its factorization.

66733945687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 64.

The spelling of 66733945687 in words is "sixty-six billion, seven hundred thirty-three million, nine hundred forty-five thousand, six hundred eighty-seven".