66666666097 has 2 divisors, whose sum is σ = 66666666098. Its totient is φ = 66666666096.

The previous prime is 66666665999. The next prime is 66666666109. The reversal of 66666666097 is 79066666666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36722440161 + 29944225936 = 191631^2 + 173044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66666666097 is a prime.

It is not a weakly prime, because it can be changed into another prime (66666666397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333333048 + 33333333049.

It is an arithmetic number, because the mean of its divisors is an integer number (33333333049).

Almost surely, 2^66666666097 is an apocalyptic number.

It is an amenable number.

66666666097 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666666097 is an equidigital number, since it uses as much as digits as its factorization.

66666666097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105815808, while the sum is 64.

The spelling of 66666666097 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, ninety-seven".