66666669907 has 2 divisors, whose sum is σ = 66666669908. Its totient is φ = 66666669906.

The previous prime is 66666669859. The next prime is 66666669911. The reversal of 66666669907 is 70996666666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66666669907 is a prime.

It is not a weakly prime, because it can be changed into another prime (66666669917) 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, 33333334953 + 33333334954.

It is an arithmetic number, because the mean of its divisors is an integer number (33333334954).

Almost surely, 2^66666669907 is an apocalyptic number.

66666669907 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666669907 is an equidigital number, since it uses as much as digits as its factorization.

66666669907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158723712, while the sum is 67.

The spelling of 66666669907 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-nine thousand, nine hundred seven".