66667366609 has 2 divisors, whose sum is σ = 66667366610. Its totient is φ = 66667366608.

The previous prime is 66667366559. The next prime is 66667366627. The reversal of 66667366609 is 90666376666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61093997584 + 5573369025 = 247172^2 + 74655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66667366609 is a prime.

It is not a weakly prime, because it can be changed into another prime (66667366639) 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, 33333683304 + 33333683305.

It is an arithmetic number, because the mean of its divisors is an integer number (33333683305).

Almost surely, 2^66667366609 is an apocalyptic number.

It is an amenable number.

66667366609 is a deficient number, since it is larger than the sum of its proper divisors (1).

66667366609 is an equidigital number, since it uses as much as digits as its factorization.

66667366609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52907904, while the sum is 61.

The spelling of 66667366609 in words is "sixty-six billion, six hundred sixty-seven million, three hundred sixty-six thousand, six hundred nine".